If you have requirements other than carpentry & joinery, here are a few companies to get you started:

www.swc-ceilings.co.uk	SWC Walls & Ceilings - Experts in partitioned walls & all ceiling types
Tony: 07850 93 11 82	Thames Decorating - For your commercial and domestic painting & decorating needs.
www.trada.co.uk	TRADA -Timber Research and Development Association - a internationally recognised centre of excellence serving the timber and woodworking trades
www.fsc.org	FSC - Forest stewardship council - promoting responsible management of the world's forests through developing standards