It's not worth setting mine. It's 2 hours ahead at the moment (although it was correct less than a week ago), then 4 weeks today I would have to put it 5 hours ahead if I'd changed it back. As I haven't done that then I only have to put it 3 hours forward, but as I'll have to change the batteries, I'd have to reset it anyway.
My vcr didn't change the time last week , I found out it was something to do with ceefax not working properly as the autochange gets a signal from this.