I have a single rad in the kitchen, when the new kitchen was fitted a second rad was removed so it's now too cold in there. The current single is on valves coming up through ceramic tiles/concrete floor - be a messy job to move these. You're only talking 35mm to valve centres on the current one, are double rads available with rear valves and if so where from? All the ones i see are centre valve and talk about at least 56mm