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Thanks for the replies. What am I best to go for then? How much is foam if I don't qualify for a grant?

OK my build up is Dabbed plaster board Celcon block Alreflex 1L1 attached to Celcon block (in the cavity) Empty 50mm cavity outer leaf of brick So the 1L1 is inside the cavity, not next to the plasterboard. My build isn't in the link you posted.

This is the data sheet for the Alreflex:- http://www.thermal-economics.co.uk/pdfs/Alreflex1L1OEM.pdf It does mention poultry sheds! I get a u value of 1.5 for my celcon block and 1.3 for the Alreflex giving perhaps 0.7 ish total. In most places the Alreflex is hard against the celcon...

I have a house built in 2000. It is very hard to heat. I have found it has thermalite blocks on the inner leaf and what looks like silver bubble wrap in the cavity. The bubble wrap turns out to be Alreflex 1L1 "insulation" - intended for poultry sheds! Estimated U-value 0.6 total. The...