Insulated underfloor heating boards (Cambridge CB3)

I have a few left over boards from installation of underfloor heating. They are 18mm thick insulated boards with grooves cut in them for the underfloor heating pipe. I have two full size 1200x600mm boards plus a number of offcuts. (This is the manufacturers page: https://ambienteufh.co.uk/system/ambideck/)

They might be useful for someone just to lay over a small floor where the (admittedly relatively thin) insulation would be useful. For example I used some of the offcuts to board over the suspended wooden floor in our understairs cupboard which has hopefully stopped a bit of heat leaking out.