You appear to think that the council is paying foir this work to be done - they aren't - it's almost certainly the warmfront scheme, which covers the
100% grants for insulation too, and has done from the beginning, about 12 years ago, although when it first started it offered only draughtproofing, then loft insulation, and now CWI and replacement boilers.The money that funds this lot was creamed off the energy suppliers as a 'windfall tax', who creamed it off us in the first place, so you see, he has already effectively paid for this boiler, through all the gas and leccy bills he has paid over the decades.