How deep? Ice? Etc? Rideable?
Which part? Plenty in east surrey area, will be icey tomorrow, rideable if you're up for just a bit of fun.
Big place so may depend where. Local patch was a slog but rideable sat and sun. Snow still quite soft and wet. Couple of inches and limited ice. Access might be more of a problem.
Depends how off piste you get really, and your definition of rideable. Main trails near or along the NDW have been squished down, so fast and grippy. Be a bit more creative with your riding and you can find some fun but harder bits to ride. The snow never really got too deep; at most on the exposed bits facing London there were four or five inches yesterday, but a lot defrosted today.
Sum up: enough snow and minus temperatures to be fun on the Downs.
Some piccies on Diary of a Mountainbiker.
Will have a nosey at DOAM