Thermal insulation board

Bg thermaline Super approx £62 a board job at ccf including vat , vapour check inbuilt , 50mm total thickness you can get thicker but more money
 

Gyproc Thermaline Super 50mm

Check ebay and see if any selling local to you for pick up, can get them for a good price sometimes. I saw 2 of the above for £50.
 
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