In reply to Mr p:
My friend was in the quantocks last night and said there was tons of snow still, and that area got a lot more it seems than Bristol or Gloucester. It's been slowly thawing all week too, so my bet would be that it will be seepage city down there right now, and that any rain or increase in temp will only make it worse - especially if warm air hits colder rock at which point you might get condensation on every surface to spice things up!
Andy