Diall Polystyrene Insulation board (L)0.8m (W)0.6m (T)9mm, Pack of 8 | DIY at B&Q
12 Large White Rigid Polystyrene Foam Sheets Boards Slabs - Size 2400mm Long x 1200mm Wide x 25mm Thick / 8ft x 4ft - EPS70 SDN Floor Insulation Sheeting Packing Void Loose
Polystyrene Insulation board (L)0.61m (W)0.4m (T)60mm, Pack of 4 | DIY at B&Q
Polyethylene closed cell foam in sheets or cut to size