On 18/12/2010 11:52, PeterC wrote:

The only other way I can think of is to insulate the underside, but that
means a lump sticking down from the ceiling!


50mm lump of insulation attached by super magnets, to be put up when
really cold and sod the aesthetics of it. Could store it up in the loft
when it gets a bit warmer?

--
Adrian C