Here are several websites that have tips, advice and good information about builders in the UK.

Accredited Roofing Coventry
Accredited Roofing specialise in chimney repairs and roofing repairs in Coventry and Wearwicksire including Kenilworth, Warwick, Leamington, Nuneaton and general West Midlands. Accredited Roofer are available 24 hours a day for all your roofing needs.
www.accreditedroofing.co.uk