Update
Hmmm. When the Green Flag guy came along and connected up jump leads, the first thing that happened was that my hazzard lights started flashing.
I can't say for certain that I didn't have them switched on, but I'm sure that I would have noticed them flashing inside a dark garage before I shut the door? Not to mention the fact that the switch is in the centre of the console so I can't even see myself catching it as I got out.
Anyway, I've had no problems since, although I haven't put the car back in the garage yet (superstitious or what!).
In answer to some of your questions, the car was registered last December (it's a 54) and was sold by the previous owner after just 2,400 miles. That makes me slightly suspicious that there may be a fault somewhere.
Another reason for suspecting a fault is that this car turns everything off after a maximum of an hour if it's left on. Headlights, interior lights, erm, everything else:wasntme: oh yeah, windscreen wipers (although what car doesn't do the wipers?)
Anyway, I'm going to keep an open mind. It might have been me turning the hazzard lights on, by knocking a switch in the centre console, and then completely missing flashing orange lights as I shut the car in the dark garage.
Honest it might:suspect: