hi, we'd be grateful for insights: we bought a house in 2015 on the basis of a ber cert saying it was a C2. We'd come from a C2 house and assumed - incorrectly on hindsight - that it would be a warm house. However on finding that we were frozen over the winter (and continuously sick), we got in a reputable heating and insulation company who said at best that the house is a D2. We have got two other companies since who have said the same, and one of them was a ber assessor as well. We are talking about 4-5,000 to get the house up to a C2. I have since got very ill and am out of work, but we need to get the house insulated and warm before the winter sets in. Is there any point trying to take this up with the auctioneer, or vendor? We feel very cheated. Any tips gratefully appreciated.