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Yes. These guys in Bristol for example.
https://cheeseproject.co.uk/They seal up your doors, windows etc with plastic then pump air out of the house to create negative pressure. Then turn the pump off, remove plastic and use a thermal camera to show where the cold air is rushing back into the house. You get a video so you know where to seal up.
lemonade
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.