Hi venuscat, no I wasn't doing major repairs, just trying to reset the stupid timer to stop the heating being on all the time. I couldn't remember how to do it - probably should have waited until I was properly awake.
Still, it gave me a chance for a brie break - I ended up eating a whole triangle of it smeared with Dijon mustard and pepper.
I wish I wouldn't do this nocturnal feasting. I'm always having to think of odd jobs to justify getting up and eating. Tonight I'm planning to varnish my neighbour.