Here are some useful contacts...
The Arboricultural Association is the largest body in the UK for amenity tree care.
Bat conservation trust
The bat conservation trust provide support training and advice for all bat related matters
Carpenters and joiners specialising in bespoke handcrafted work
The RSPB are a charitable organisation working to promote conservation and protection of birds
The forestry commission is the department responsible for forestry in England and Scotland.
A discussion forum for arborists, tree surgeons and forestry workers
Through research, technology, and education, the International Society of Arboriculture (ISA) promotes the professional practice of arboriculture and fosters a greater worldwide awareness of the benefits of trees
National recognised awarding body for certificates of competance within land based industries.