Gary the Tank (whose brother recently died - mentioned elsewhere) is a damn good heating engineer. The scheme will work well for companies with big contracts for local authorities, although not so well for him as a self-employed, by word-of-mouth chap. Either way, he maintains to this day that the new sort of boilers you are obliged to fit - combi condensers - really have fundamental flaws with British weather. You might get a better boiler now, but it will go wrong and cost you a lot more in the long run.