Here are some useful links to peruse if you are thinking of a loft conversion…

The Complete Loft Conversion Book (TeleBeam is featured on the cover) – The UK’s most comprehensive guide to designing, building and managing a loft project.
Homebuilding & Renovating is the UK’s best-selling magazine for self-builders and renovators. Each issue if packed full of inspirational house design ideas, products and features to ensure your new home is a real success. Written and produced by experienced self-builders and renovators, it also offers expert advice on everything from planning permission, choosing architects and finding builders to buying plots, choosing materials and keeping costs under control.
LABC – Local Authority Building Control
Find an architect (RIBA guide)
Velux – renowned for roof window solutions
Screwfix – suppliers to the DIY & building trade
Federation of Master Builders – professional body of the building trade, this site has useful info. on finding a builder, contracts with builders and other info.supplier of space-saving and high-performance thermal and acoustic insulation products
Thermal Economics – specialist provider of space-saving and high-performance thermal and acoustic insulation products
LoftShop – Specialists in loft fittings (windows, stairs, flashes). This link takes you to their frequently asked questions page which explains more about trussed lofts and building regulations.
Arch-tech UK Ltd. has over 30 years experience working with in the Architectural Profession and provide services to Private Clients, Architects, Developers and Construction companies.
Loft Centre provides a range of brand new loft ladders, loft hatches, spiral staircases, loft stairs, electric stairways and spacesaver staircases