So, yesterday, having pittled around on the internet for an hour, I had to order another hour's internet access in order to pittle around some more working out how to start getting the boiler progressed from off-due-to-condemnation towards fully-working-due-to-non-condemnation. It's easy to condemn the boiler, but it's not its fault. The fault lies with the small gas leak - I wondered why the gas bill was so high, some ventilation (oooh, smelly) and the need for a switched, fused, spur, rather than a junction box. None of these should be a big deal. Except the gas leak, which could be the big deal of the year.
Oh, one small thing... if any of the operational parameters of the boiler change too much, and it fails... then there's no repair and a £6000 (count 'em) replacement cost for the entire heating system. Oh the happy times are here again.
So. It's nice and relaxing here on my holiday.