Stansgran Can you afford to pay for a Green Deal survey? They should be able to tell you what you need to do to make your house energy efficient and should find any failings in your current home insulation. You do not need to then sign up for the Green Deal. I think the survey costs about £150.00. Is it possible that the contractor recommended by the council didn't do what he was paid to do and that your cavities and roof are not fully insulated?
We bought a new house in the 1970s when the first building regulations for insulation came in. Ours was the last house on the site to be completed and when we went in the loft we found the builder had used rolls of much thinner wall insulation to insulate our loft and if a role ran out half way along a rafter run, they left the rest of that rafter space uninsulated. I suspect they couldn't be bothered to get the proper materials when there was only one house left to finish.
I agree with JessM over condensation. When we first had our house in France the walls would stream with condensation during every winter visit because the house was uninsulated and the thick solid walls were very cold. Now that we have replaced the windows and insulated most of the exterior walls and the roof we have no condensation because the walls no longer get so cold.
A new boiler will not require all the central heating system to be replaced, just the boiler so there should be no need to replace central heating pipes set in the concrete screed.
Fonthill Garden Centre Bitton 2.30



. Condensation could of course cause your paper to peel. Did this occur before or after the insulation I wonder? 