I got the three warning lights (ABS, ASR, VDC) after about 1 minute of driving in the snow today. Since then they come on as soon as the car is turned on.
In case it's relevant, I did leave the handbrake on last night out of habit. The handbrake warning light doesn't seem to come on now.
Also, the garage who inspected the car said that the battery was borderline, and it did take a good few seconds for the car to turn over first time this morning.
The problem is that I'm stranded at the moment - can't get out of my road as it is, and can't take public transport to work. This freeze is supposed to last for at least a week so need to try and get something sorted ASAP.