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Hoefla has said as much but look for someone who is Enerphit certified, I was going to get an old colleague of mine to give our house a look over but decided to move (neighbour issues) so never followed it up but if you want a man with a infra red camera and knows what they are doing it's worth a look.
This is his website for your info, based in Aberdeenshire so probably not terribly useful but he has interesting info on his site
Are there businesses at the residential end of the scale that can do a detailed energy survey (more than just someone who tells you to get energy saving lightbulbs) and advise different solutions with different costs and savings, etc? Ideally someone independent rather than someone who wants to flog their solution.
I had my central heating on for 5 hours, full blast, last night and that increased the temperature in the house by about 3.5 degrees (up to 17.5) and by the morning had dropped back down to about 12. Ideally I'd like to know whether this is due to poor insulation, poor heating, dodgy windows, etc. and how to rectify.