Easily resolved. Just lie. "10 dev C and you're going to bed in a FLEECE! If I'd known you were going to cheat, well... Y'see my place is at 9, at least once the sun's been up a few hours, but I only put a sweater on first thing."I should disclose there is a bit of a competition going on between me and and one of my work colleagues over who can tolerate the lowest house temperature. He's a tough competitor - wears a fleece jacket to bed. Hopefully this won't all end in burst pipes....