Yes, Diall Polystyrene Insulation board Size's (L)0.8m (W)0.6m in thickness's of - 3mm - 6mm -9mm.
The board plan dimensions in inches is 31 1/2 times 23 1/2, the 6mm pack, I think there is 8 sheets in the pack, it's best to check the stock in each store on line before you go down to pick it up, or order on line.
B & Q stock it. **LINK**
The foam works and models really well just like depron. I've purchased many packs in the sizes -3mm -6mm and the 9mm. I mainly glue it together with hot glue, however I've just purchased my first supply of UHU por.
Current foam project.
A neighbour had these blue wings, he lost the fuselage in a spiral dive many years ago, it was the Hitec Sky Scout version, I was more than happy to build him a fuselage in the current lockdown.
Above an old advert from the pages of RCME (2003 ) for the original rudder elevator and motor control model.
It's been test flown and he's purchased a new transmitter for his 8 year old son to hopefully fly it this spring.
It happens his dad really enjoyed flying it again, so I set to to build him a fuselage and the wing I'm still working on.