Heh, we don't(except for the main fire and a couple of oil filled rads), we are decorating at the min and as I was walking past teh downstairs bathroom at 8:45 I heard running water. But none of us had been in the bathroom so I went to investigate further only to find teh flexible pipe to the hot tap has split wide open and boiling water is squirting everywhere. So its a sudden try and remember which tap on teh pipes under the boiler turns teh water supply off. so no heating or hot water till tomorrow
Ah well, at least it didn't happen when we had gone to bed or it would have been going all night!