My mothers boiler went kaput..... So I called in a few favours off a mate of mine. He fitted a new Printed Circuit Board, and a couple of other new parts.
He told me if it had been a call out from a major gas firm, it would have been £380 plus vat ,obviously he did it for half that for me. Here endeth the lesson, like cars, people will skimp on things in the recession, and if your skint, boilers are the last thing money goes on.
Beware if your boiler starts making funny noises, start saving up. By the way, it was only a 10 minute job.