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My friend in Co. Wexford does this type of work all over NI and the Republic: http://greenbuild.ie/ . He's a super bloke, you'll be in good hands.
We had these guys in
https://cheeseproject.co.uk/
Was very cheap and quite interesting. They seal up your house with plastic, you heat it nice and hot on a cold day outside, they use big fans to increase the pressure inside, then they use a temperature gun thing and you get a nice video of all the heat escaping.
I haven't actually got round to addressing much of it but it was quite illuminating. For example I never would have suspected about half our light fittings have much bigger holes than necessary and tonnes of heat escapes through them. You couldn't see it until the light fittings were removed.