Liz wrote:
While I am burning the midnight oil I would be really grateful if
someone has the R values for
Wickes 50mm General Purpose Slab Insulation and
Wickes 30mm Heavy Density Slab Insulation.

I've got half a pack of slabs of Wickes Flexi Insulation (Rockwool);
1125 x 600 x 50mm - is that the stuff?

R value is given as 1.30 m2K/W at 50mm

David