Hmmm having a flick through - there is only a 1 year warranty on the Alpha HE33 but at that price you could get a contract with Gritish Bass for servicing etc for a couple of years and not pay any more than the WB boiler.
Hmmm, WB five year warranty and the optional WB four year service plan works out at £52 PA as opposed to 4X £180 PA for BG homecare plus Alpha boilers are sh!te