I received a brochure from an organisation called Warm-front stating that I might be eligible for a government backed grant of up to at that time £3,800 for up grading my heating. I did a bit of checking and the result was I got a full central heating system, Combi boiler, radiators, pipe work etc, cavity wall insulation and loft insulation. The quote for the work was slightly higher then the grant so I got the whole lot done for just over £200.00p. I told my mate and by the time his application went through the grant had been raised nso he didn't have to pay any excess. If you've any doubts check with the council or your local CAB but I would definitely look into it