But they had on dem there an electric underfloor system by Warmup.

You could get a cable kit to do this for about 550 quid including VAT.
(FHC3600 on the link below).

http://www.discountedheating.co.uk/s...able_Kits.html

It would cost an absolute bomb to run as the main heating. However, if you
set the floor temp low, (i.e. 21C) and use your central heating to heat the
actual room, it should take the edge off the running cost.

Better would be a wet underfloor system for this size of room. It could be
the primary heat source and efficient to operate. Running this in the new
suspended floor would be easy. The old concrete, however, would be
problematic. It would need insulation and channels for the pipes. Probably
easier to remove the old floor and make it suspended with the rest of the
room.

Christian.