hi.my dad had the same problem finding a good roofer until one of his old friends told him he had is roof fix for a very good price and he didnt want paying until it was fix,not like these other roofers who want payment up front,his name is jimi of academy roofing and i have found is web site.
www.academyroofinguk.com if you look there you will get his contact details. and i think this number is his land line 01254 390678.hope this as been some help.