Chobham Tree Surgeons (GU24): If you've got sizeable trees in your garden in Chobham, you will most likely need to have them looked at by a tree surgeon at one point. Cutting lumps off trees isn't really something you ought to be engaging in yourself, except when you have the necessary skills and expertise. A competent tree surgeon (arboriculturalist) will have all the proper safety equipment and should be fully conversant with the regulations and legislation with regard to trees and their management.
There might be many reasons why you might need to speak to a tree surgeon, so it would be helpful to run through them right now. Chobham tree surgeons don't just take care of dangerous trees that may fall onto a road or structure, as you would have seen during windy weather. They also do things such as removing old tree stumps that are in the way, thinning or reducing trees to allow more light into the garden, developing tree maintenance or management plans to keep your trees in good shape and monitoring trees for damage or disease so that such issues will be resolved before they become more serious.
Before choosing any tree surgeon you ought to be sure that that they are affiliated with the Arboricultural Association, the main professional body for this occupation within the United Kingdom. They should also have the appropriate public liability insurance so that any accidents or mishaps are covered, and should be willing to assist you with the relevant applications for approval to do the tree work from the local authority. A tree assessment must be completed prior to any work beginning to double check that your trees aren't located inside a Conservation Area or protected by a Preservation Order (TPO).
Of course safety is the main worry when undertaking any form of tree surgery in Chobham, and your tree surgeon ought to be acquainted with all of the correct safety measures. He will be kitted out with all the necessary gear to safely work on your trees to ensure that they're not harmed in any way, nor any damage is done to your loved ones or your property while any work is done.
When your tree surgeon turns up he will unload all sorts of equipment and tools, most of which he will employ for either ascending the tree, chopping branches off the tree or the treatment of the resulting branches and waste materials. This equipment will include things like slacklines, rigging plates, winches, rigging ropes, harnesses, lowering winches, chain saws, stump grinding equipment, climbing ropes, axes, pole saws and wood shredders. Some of this gear is really clever and helps make the whole tree surgery process just that little bit simpler and safer.
There are a lot of waste materials produced during the process of tree surgery and this needs to be taken away and responsibly got rid of. This should all be itemised in the original quote, so check that this is in fact so. The ethical disposal of tree waste is a moral responsibility for all tree surgeons, so be suspicious of anyone that cannot verify that this actually applies in their case.
It is not just in Chobham where your tree surgeon will be willing to work, therefore folks residing in close by areas like Bisley, West End, Donkey Town, Horsell, Lyne, Longcross, Ottershaw, Mimbridge, Castle Green, Burrowhill and others, will still be able to have trees dealt with when they need to. Thus, wherever in the Chobham district you call home, it will be easy to uncover an honest tree surgeon, and additionally all around Surrey and bordering counties.
Chobham tree surgeons also oversee protection and preservation of woodlands, in addition to the climbing, pruning and removal of trees. Through attentive observation they can highlight possible hazards that could put the public in jeopardy. An integral part of their duties is making sure that trees are disease-free, healthy and in a position to prosper and grow.
Tree surgery is available in Chobham and also in nearby places like: Windlesham, Donkey Town, Lightwater, Ottershaw, Horsell, Lyne, Castle Green, Mimbridge, Bisley, Longcross, Sunningdale, Sheerwater, Knaphill, West End, Burrowhill, and in these postcodes GU24 8PY, GU24 8PE, GU21 4YA, GU24 8HD, GU24 8QY, GU24 8LY, GU24 8AH, GU24 8RJ, GU24 8DX, and GU24 8PS. Locally based Chobham tree surgeons will likely have the postcode GU24 and the telephone dialling code 01276.
If you need this type of service it is definitely advisable to bring in an approved tree surgeon. Chobham home and property owners can benefit from the dexterity and skills that are the trademark of a trained professional.
Obtaining Help and Guidance
To make sure that you find a tree surgeon or arborist who's both up to the job and who will not inflict irreparable damage on your trees, there are a number of specific questions that you need to ask when looking for a tree surgeon in Chobham. Suitable questions should be something like: Have you got public liability and employment insurance? Do you have membership of a reputable professional association (i.e. The Arboricultural Association or the International Society of Arboriculture)? Are you able to give references from past customers? Will you provide me with a written quotation? Do you and your workers have the proper certifications and qualifications (for tree care and chainsaw use)? Do your working practices adhere to the BS3998 British Standard? If your tree surgeon doesn't give you satisfactory replies to any of these questions, think twice about employing him.
To find a great deal of practical details regarding things to look for in a good tree surgeon, along with a comprehensive directory of experienced tree surgeons in the United Kingdom, you should visit the Arboricultural Association site. The International Society of Arboriculture is another excellent resource which has a "verify tree surgeon credentials" tool and a "find a tree surgeon" tool. You are also able to study detailed facts about tree surgery as a profession by visiting the trusty Wikipedia "Arborist" article here. Submitting a form with one of the well known trade review portals like Rated People or Local Heroes, where customer testimonials and reviews are available to look at and professional credentials have been previously verified, can also save you a great deal of time and effort, since they carry out most of the hard work for you. The Government approved Trustmark website is also a solid place for identifying professional tradespeople, including tree surgeons.
Tree Surgery Training - Courses - Apprenticeships Chobham
Having a career in tree surgery is a rewarding and fulfilling way to make a living. Possibilities like beginning at the bottom (maybe as a groundworker) and working towards this goal, registering for a private course, taking a university course, being accepted into a tree surgery apprenticeship or enrolling for a college course are accessible to anybody in Chobham wishing to be a tree surgeon. Applications for tree surgery apprenticeships in Chobham can be sent in while you're still at school, when they are available locally. All over the British Isles, there are private and college courses in tree surgery, and individuals of all ages can register. University courses are available in various sectors including woodland ecology & conservation, countryside management, arboriculture, forestry and forest management, with higher national diplomas, foundation degrees and degrees open to people with the appropriate qualifications (typically one to three "A" levels). If you don't fancy any of those solutions, you may wish to undertake some voluntary work in order to get some practical tree surgery experience. You could try contacting the National Trust, the Forestry Commission, the Tree Council or the Woodland Trust, to find out what might be available in the Chobham and wider Surrey area. I hope that this brief article has proved helpful if you arrived here trying to find details on "how to become a tree surgeon in Chobham". The National Careers Service website is the place to head to view much more tips on how best to become a tree surgeon. (Tags: Tree Surgery Training Chobham, Tree Surgery Courses Chobham, Tree Surgery Apprenticeships Chobham)
Tree Removal Chobham
When a tree turns hazardous, becomes ill, or grows too large for its spot, removal often becomes essential. Trees are important for our environment, but every now and then, they can endanger nearby homes or people. Issues like overhanging branches, roots causing damage, or the possibility of a tree falling down can lead to the conclusion that removal is the best option. This isn't a decision to rush into, yet when the time comes, it can significantly boost the safety and usability of your outdoor space in Chobham, providing you with some peace of mind.
Removing a tree isn't always as simple as it looks, particularly when it comes to larger specimens. The process requires careful preparation and the right tools to ensure the job is done safely and effectively. Tree surgeons are highly trained to assess the tree and decide on the best approach, keeping the surrounding area intact as much as possible. They'll also manage the disposal, sparing you the effort and hassle. Trying to remove a tree yourself can be risky, so for bigger or more challenging jobs, it's always better to rely on a professional.
Once a tree is removed, it can really open doors to new possibilities in your outdoor space. You'll notice the extra light, which can be a huge plus for nearby plants, and that vacant area can be turned into something new, like a patio, a driveway, or a garden feature. Whether you're looking to improve safety or just to rearrange your garden's layout, carefully considering tree removal can transform your Chobham garden or outside area, making it a more enjoyable space to be in for years ahead. (Tags: Tree Removal Chobham).
Crown Thinning Chobham
In order to minimize the stress put on particular branches as a consequence of gravity, wind, ice, or snow, to minimize the wind resistance of the tree, to lessen the total weight of the crown of the tree, to enable more light to pass through or to prevent the tree from uprooting in strong winds, a lot of the little branches that grow in the outer crown of a broad leafed tree are trimmed in a process which is often known as crown thinning. The shape and size aren't altered by this process, and the probability is it will have to be carried out on a regular basis, as shoots continue to sprout. Crown thinning should never transform the all round form and size of the tree, but needs to establish a uniform foliage thickness around consistently distributed branches. (Tags: Crown Thinning Chobham, Tree Crown Thinning Chobham, Crown Thin Chobham)
The Use of Chainsaws
The most common piece of equipment that tree surgeons in Chobham use is the chainsaw. It is an effective and versatile tool, but can be very dangerous in untrained hands. The most popular style of chainsaw with tree care professionals is the petrol driven version, being easy to handle and more portable, although nowadays you are able to purchase mains operated chainsaws and rechargeable battery ones. Where thick limbs and large tree trunks are involved, such heavy tree work requires the use of the most robust and powerful petrol driven chainsaws.
A chainsaw basically comprises a rotating motor-driven chain which is armed with a row of sharp teeth that cut through the bark of a tree and the wood beneath. There are also a variety of types of chainsaw, top-handled for working at height (and which can be used single handedly), pole saws for hard to reach branches and long distance pruning and rear-handled for work at ground level (two handed).
Despite the fact that carrying a rapidly spinning blade whilst precariously balancing up a tree is certainly not the safest job in the world, it's rare to find a professional Chobham tree surgeon who does not use a chainsaw in his/her day-to-day activities. To be able to gain membership of the Arboricultural Association, being trained in the safe use of chainsaws is one of the key requirements for tree surgeons.
The most popular makers of chainsaw used in the UK by tree care professionals are Stihl, Husqvarna, Makita and Hyundai, although there are many different makes.
Conservation Areas & Tree Preservation Orders Chobham
Before you do any significant work on your trees in Chobham, you need to make certain that there is not a TPO (Tree Preservation Order) on any of them. You must contact your local authority to find out if any of the trees on your property are subject to TPOs. If there are Tree Preservation Orders on one or more of your trees, you will need consent in writing from your local authority to conduct any of the following: uprooting, wilful damage, topping, removal, cutting down, wilful destruction or lopping. Your tree surgeon should be able to advise you on this and help you out with any checks.
If your property is within a conservation area in Chobham, and propose to carry out any work on a tree with a trunk diameter of 75mm or more, you must give at least 6 weeks written notice to your local planning authority. (Tags: Tree Preservation Orders Chobham, Tree Preservation Order Chobham, Tree Preservation Orders (TPOs) Chobham).
Tree Surveys Chobham
There are a number of reasons why you could need to have a tree survey conducted, and the most commonplace is for property extension or land development. If, for instance, you're clearing some land in Chobham to make room for a new home or an extension to an existing property, and there are trees on that land, you will need to carry out a professional tree survey to British Standards BS5837 (2012). All tree surveys should be performed by a qualified arboricultural surveyor or tree surgeon, regardless of whether they're being carried out on private or public property in Chobham.
For a specified area, a number of details will be gathered about the trees within it. For instance:
- The predicted lifespan of the trees.
- The number of trees (those of more than 75mm diameter 1.5m from ground level).
- The existence of any Tree Preservation Orders (TPOs).
- The age of the trees.
- A tree reference number for each of the trees.
- The diameter of each tree (measured 1.5m above ground level).
- The species of trees on the site.
- The branch spread to East, North, South and West.
- The height of each tree.
- Preliminary tree management recommendations.
- The health of the trees.
A tree survey probably won't be necessary if you're not increasing the property's footprint nor are you changing the access points or service lines of an existing home in Chobham. (Tags: Tree Surveyors Chobham, Chobham Tree Surveys, Tree Survey Chobham, Tree Surveys Chobham).
Problems With Tree Roots Chobham
Because some trees have really invasive root systems, if they are growing too close to your home in Chobham, they can lead to various problems, potentially serious ones. Among the most commonplace problems are: damaged foundations, lifting patios and blocked drains. Species like sycamores, maples, elms and willows, are trees that have very invasive root systems.
Issues can be avoided down the road, if you make certain that you plant any new trees as far away as possible from your sewerage pipes, your house, pathways and patios. If some of these issues are already being caused by existing trees which are growing too close to your house, you should get hold of a tree surgeon in Chobham for guidance and advice.
This is not really the sort of job that you should attempt to do by yourself, and just hacking away at the invasive tree roots could kill off the tree or seriously affect it's overall health. So that any damage to property is minimised, and the tree is still able to get sufficient nutrients and water to survive and thrive, an established arborist in Chobham will know which roots can be safely cut back, and which roots should be left in place.
Subterranean drains are extremely attractive to tree and shrub roots, as they provide a consistent source of moisture and nutrients, and they can regularly suffer structural damage. A drainage system's joints can very soon be compromised by minute tree roots, which when established can develop into sizeable root balls and eventually cause joint failure and blockages. To get rid of the offending roots, high quality root removal solutions will be provided by some Chobham tree surgeons, who'll employ manual rodding, high pressure jetting or electro-mechanical equipment. You can also obtain root removal services in Bisley, West End, Donkey Town, Horsell, Lyne, Longcross, Ottershaw, Mimbridge, Castle Green, Burrowhill, and in Chobham, Surrey.
Tree Emergencies Chobham
Having to contact a tree surgeon for an emergency is not an occurrence that's liable to arise very frequently, however if you've got trees growing in your Chobham garden, this might be a necessity at some point. Tree surgeons in Chobham expect to receive a huge surge in emergency call-outs when there are strong winds and gales, which is why many of them offer a 24/7 service to cater for this eventuality. The risk of injury or damage is greater when the weather is gusty, with branches snapping off and falling to the ground below, and sometimes even whole trees collapsing. Common issues that happen as a result of tree emergencies are squashed sheds, broken garden furniture, damaged fences and smashed greenhouses.
Emergency tree care services will also often be needed by the local authorities in the Chobham area, because sizeable branches can break off and drop onto streets, railway lines and public pathways, necessitating urgent attention.
Even after the emergency tree surgery has been accomplished, a tree that has lost some large limbs may have to be "re-balanced", and this might be done for aesthetic reasons or because the tree now looks uneven, with the weight unevenly distributed, perhaps resulting in additional problems. For all these issues, you should call a local tree surgeon in Chobham who provides emergency tree care services, and they'll handle all of this for you. You should also be able to obtain emergency tree services in Bisley, West End, Donkey Town, Horsell, Lyne, Longcross, Ottershaw, Mimbridge, Castle Green, Burrowhill, and Chobham itself.
Control of Vegetation
Tree surgeons do not simply deal with the removal and care of trees alone, they'll also help with all types of vegetation which might be strangling your garden and taking over the whole area. Often tree specialists will be happy to take out shrubs, bushes, overgrown vegetation and weeds which may be growing near to garages, sheds, buildings, drives or paths, and creating a pain. If you're to manage your garden correctly then all of this excessive growth should be reduced at least once a year, and if you find you've got the inclination and time then this is a task you can do on your own if you're fit and able, or you might ask a local tree surgeon to come annually to keep it looking good. Vegetation management is important if you are to have safe and easy access to all parts of the garden and if this is overlooked the vegetation will pretty quickly take over and take away the enjoyment of your garden. Besides anything else the garden will also look a picture when maintained properly. (Tags: De-Vegetation Services Surrey, Vegetation Management Chobham, Vegetation Control Chobham)
Ash Dieback (Hymenoscyphus Fraxineus)
Most likely to wipe out about 80% of the current British ash trees, in the next few years, ash dieback (Hymenoscyphus fraxineus) is a highly infectious fungal disease of ash trees that was first documented in Great Britain in 2012. Ash dieback is going to have a massive impact on our beloved countryside, exacerbating the tragedy resulting from the earlier Dutch Elm Disease (DED) crisis.
A disease that affects the Fraxinus genus of trees, it has an especially disastrous effect on Fraxinus excelsior, the native British common ash. Originally coming from eastern Asia where the native Chinese ash (Fraxinus chinensis) and Manchurian ash (Fraxinus mandshurica) are less seriously affected by it, the fungus which causes the disease is known as Hymenoscyphus fraxineus (H. fraxineus), and it kills the tree by blocking its water transport (vascular) systems.
Dispersed by wind blown spores which are able to travel for tens of miles, ash dieback has now spread to most parts of Great Britain.
Ash dieback has an effect on trees of any age and has the following symptoms:
- Leaves that develop dark patches during the summertime.
- Wilting leaves that turn black in colour and drop early.
- New epicormic growth appearing from previously dormant buds (common in trees under stress).
- The formation of lesions (often diamond shaped) where branches meet the trunk.
- Leaves and shoots which are visibly dying during the summer.
To a certain degree, ash trees are able to fight off the disease, however they ultimately die as they are continually attacked year-on-year. There is not yet any cure for chalara ash dieback, and because it's an airborne disease, no certain way of stopping it spreading.
Although you can report cases of ash dieback to the "Tree Alert Service" provided by the Forestry Commission, it's now so common all over the UK that they're only really interested to know about cases that are discovered in locations not affected previously. If you suspect you have a tree suffering from ash dieback in your garden in Chobham, you should contact a local tree surgeon, who will offer guidance about how to proceed - ultimately the trees or tree will have to be felled and removed.
Trees which are affected by ash dieback: Fraxinus excelsior, Fraxinus angustifolia, Fraxinus nigra, Fraxinus ornus, Fraxinus pennsylvanica, Fraxinus mandschurica, Fraxinus americana.
(Tags: Chalara Ash Dieback Chobham, Spotting Ash Dieback, Symptoms of Ash Dieback).Woodland Clearance Chobham
The clearance of woodlands in the Chobham area should only be started after any regulations and restrictions have been put in place and observed. A certified tree surgeon in Chobham will be able to provide you with a full end to end service that will adhere to all laws and covenants on the land, and also do the clearance in an eco-friendly and ethical way.
A thorough habitat survey will be completed by a tree surgeon who will also communicate with woodland authorities and organisations to ensure that your woodland clearance is done safely and legally. Mitigation procedures may have to be employed if there is protected plant or animal species in the area; this could call for replanting of trees and relocation of animals, such as reptiles or bats to another protected site.
Due to the equipment used in woodland clearance, i.e. felling, chipping and mulching machines, it is highly cost effective to employ a qualified tree surgeon to complete the clearance. (Tags: Woodland Clearance Chobham, Woodland Management Chobham, Woodland Preservation Chobham, Woodland Clearances Chobham).
Tree Cable Bracing Chobham
In specific situations where a tree is showing signs of damage, decay, or is a threat to nearby property or persons, a procedure called cable bracing may be used to offer support to the tree. This method is generally used on older or specimen trees in Chobham, where the felling or removal of large unstable portions must be avoided for reasons of aesthetics.
Fitting a cable bracing setup may sometimes be possible to add support to the weak limbs, V-shaped forks and defective joints of a tree. To help alleviate structural tension and extend the life of old and valuable trees most tree surgeons in Chobham will be able to carry out various forms of bracing work through the fitting of rods and cables.
Cable bracing does not cause further damage to the tree by drilling and bolting the branches, and offers a shock-absorbing and flexible method of support that is essentially non-invasive. A thorough risk risk assessment must be carried out by an arborist of tree surgeon before any actual cable bracing work can begin. This is essential to guarantee the safety of the tree and encompassing areas as the project proceeds. (Tags: Cable Bracing Methods Chobham, Cable Bracing Trees Chobham, Cable Bracing Chobham, Tree Cable Bracing Chobham).
Dutch Elm Disease
Although Dutch Elm Disease (Ophiostoma novo-ulmi) is not quite the issue it once was, over the past 50 years or so it has killed millions of precious elm trees all around the British Isles. Unintentionally brought into the British Isles, by means of elm logs imported from Canada in the 1960s, DED (Dutch Elm Disease) is caused by the fungus Ophiostoma novo-ulmi which is spread by the elm bark beetle (especially the Scolytus genus).
After arriving in the UK, it was spread rapidly through the movement of elm products such as crates, bark mulch, saplings, and firewood logs with the bark still attached. This terrible disease did not just affect elms in the United Kingdom, but also decimated tree stocks in continental Europe and North America. While the origins of DED are as yet uncertain, the suspicion is that it first originated from Asia (possibly Japan).
Dutch Elm Disease typically first appears in early summer, and the main signs are:
- Twigs that turn into a "shepherd's crook" shape.
- Twigs with dark streaks beneath the bark.
- Shoots that die back from the tip.
- Clusters of leaves turning yellow, wilting and falling.
Due to disease and the chopping down of dead, infected and dying trees, there are not many large elms surviving in the UK countryside, and thus the spread has slowed down and the beetle's favourite habitat essentially decimated. The propagation of young elms that are so far resistant to Dutch Elm Disease is a continuing project.
You can speak to your local tree surgeon for advice and guidance, if you are suspicious you may have infected elm trees on your property in Chobham, or you could request a diagnosis from the Tree Health Diagnostic and Advisory Service (THDAS), for which there is a fee.
Tree Surgery - Safety Considerations
The health and safety issue is one of the main considerations when you are having tree surgery done, as if conducted incorrectly it can definitely be an extremely dangerous undertaking. Untrained or inexperienced "tree surgeons" in Chobham are liable to cut corners and disregard accepted safety advice, which means that there might be not putting on hearing or eyesight protection, neglecting to cordon-off the area to protect vehicles and passing pedestrians, falling timber and branches, inadequate head protection, little or no protection from falling, in the form of ropes, harnesses and platforms and failure to put on cut-proof (chainsaw resistant) apparel (especially safety boots and leggings). In danger owing to these incompetencies are the actual tree, the groundsman, pedestrians, fencing and garden features, nearby buildings, passing and parked vehicles, facilities on the street, the property owners family, the tree surgeon himself (up the tree).
Tree Surgery Tasks Chobham
Chobham tree surgeons can usually help with tree cabling, hedge lowering, pest management, tree inspections, arboriculture, fruit tree pruning, tree watering, eco-plugging, emergency tree removal, shrub maintenance, woodland management, cut sealing, crown lifting, tree cutting, pollarding, site clearance, root grinding, formative pruning in Chobham, woodchipping, tree lightening protection, tree maintenance, tree fertilising Chobham, tree reduction, tree dismantling in Chobham, vegetation management, damaged tree cutting and removal, tree topping, safety inspections, dead wood removal, hedge reduction, brush cutting services in Chobham, crown cleaning, hedge cutting in Chobham, tree transplanting, root removal in Chobham and other tree surgeon services in Chobham, Surrey. Listed are just a handful of the activities that are handled by local tree surgeons. Chobham companies will be delighted to keep you abreast of their entire range of services.
Tree Surgeons Near Chobham
Also find: West End tree surgeons, Sheerwater tree surgeons, Sunningdale tree surgeons, Burrowhill tree surgeons, Ottershaw tree surgeons, Lightwater tree surgeons, Knaphill tree surgeons, Horsell tree surgeons, Bisley tree surgeons, Donkey Town tree surgeons, Lyne tree surgeons, Mimbridge tree surgeons, Castle Green tree surgeons, Longcross tree surgeons, Windlesham tree surgeons and more. Most of these areas are serviced by tree surgeons. Local residents and others can obtain estimates by clicking here.
Tree Care Services Chobham
- Tree Reshaping
- Crown Raising
- Forestry Management
- Stump Grinding
- Crown Reduction
- Stump Removal
- Crown Removal
- Tree Bracing
- Air-Spading
- Tree Surveys
- Root Removal
- Dead Wooding
- Tree Felling
- Tree Inspections
More Chobham Trades: Not surprisingly, when you're having tree surgery done in Chobham, Surrey, you will probably need other garden related services, and together with a tree surgeon in Chobham, Surrey, you could also need garden sheds in Chobham, soil irrigation in Chobham, hedge cutting in Chobham, landscaping in Chobham, artifical grass in Chobham, garden clearances in Chobham, garden waste removal in Chobham, planting services in Chobham, block pavers in Chobham, fence installers in Chobham, pond maintenance in Chobham, patio layers in Chobham, garden design and planning in Chobham, lawn mowing services in Chobham, SKIP HIRE in Chobham, decking fitters in Chobham, and other different Chobham tradespeople.
More: Eco-Plugging, Tree Pollarding, Tree Topping, Woodland Management, Tree Topping, Tree Pollarding, Tree Watering, Tree Shaping, Hedge Cutting, Arboriculture, Wood Chipping, Tree Planning, Stump Treatment, Eco-Plugging, Hedge Reduction, Root Decompaction, Hedge Planting, Air-Spading, Woodland Management, Root Decompaction, Tree Shaping, Tree Lopping, Site Clearance, Hedge Reduction, Tree Watering, Tree Maintenance, Root Decompaction, Crown Thinning, Vegetation Management, Crown Raising.
If you're interested in local Chobham info click here
Tree Surgery GU24 area, 01276.
Tree Felling Chobham - Tree Surgeons Near Me - Crown Lifting Chobham - Tree Surgeons Chobham - Stump Grinding Chobham - Arboriculture Chobham - Tree Care Chobham - Tree Reshaping Chobham - Tree Management Chobham