Here are some useful contacts...
The Arboricultural Association is the largest body in the UK for amenity tree care.
The forestry commission is the department responsible for forestry in England and Scotland.
The bat conservation trust provide support training and advice for all bat related matters
Bat conservation trust
A discussion forum for arborists, tree surgeons and forestry workers
Carpenters and joiners specialising in bespoke handcrafted work
W J Green
A family run business in Hadleigh Suffolk specialising in forestry and garden machinary
The RSPB are a charitable organisation working to promote conservation and protection of birds
National recognised awarding body for certificates of competance within land based industries.