Screwfix sell some aluminium floor insulation (Foil Tec Floor Insulation, product code 51524) - "Double sided insulation for suspended timber floors."
Idiot question this, but is it intended to go under the carpet underlay or under the floor itself? I reckon the former, but I don't want to look a charlie by not asking!
Our bedroom floor gets a bit chilly in the winter but there's only that some naff foam backed stuff down at the moment and, in due course, it'll get replaced with proper carpet and underlay. Do these sort of floor insulation products work?