I just tried Thermilate and think it's great value for money and a simple solution for older houses. We have an old house (1900ish). Our outside walls were very cold and, as there are no cavities in the walls, cavity wall insulation wasn't an option. We didn't want to lose our lovely brick facade so anything on the exterior was also out of the question. Building insulating walls on the inside seemed expensive and we didn't want to lose space on the interior. I thought that for the money Thermilate was worth a try. The walls are now definitely warmer and the house gets and stays warmer. I bought it from Paints Direct and got the 3 for 2 offer. It was enough to do all the outside walls (2 coats) in our 3 bed semi and definitely the cheapest option. We even had with a bit left over. It really is, as the others say, part of a bigger picture. We've been plugging up cracks, insulating under floor boards and replacing some very old loft insulation (from B&Q's half price sale). It all adds up to a warmer house and lower bills. I think Thermilate might also be good for ceilings on top floors if you have any parts of your loft that you can't insulate. I'm going to put the left over on the ceiling in the basement. If you can't do cavity wall insulation (which is best), this is a cheap and effective alternative. Hope this helps.