I have just paid £3,844.00 for a new Worcester Greenstar 30Si Combi Boiler, New Trvs on 6 old radiators, Power Flushing, Universal Timewatch & plus RS Thermastat, Condensate Soakaway, Horizontal Flue and New Gas Pipes externally. That was with £500.00 off too for my old boiler. I also have 1...