I have been asked to reply.
The Warm Front scheme offers an aftercare provision with cover for parts and labour under all installed gas central heating systems for two years. The latest period for which figures are available is 1 September 2007 to 2 April 2009. The following data show system repairs (including, although not exclusively pertaining to, boiler repairs) in Bexleyheath and Crayford and England respectively:
Number 1 Visit 262 2 Visits 65 3 Visits 32 >4 Visits 9 Total properties covered 1,323 Total Properties Visited 368
Number 1 Visit 66,890 2 Visits 20,617 3 Visits 6,353 >4 Visits 3,027 Total properties covered 377,256 Total Properties Visited 96,887