In reply to davidbeynon:
Nah, it's good fun, as a mini-adventure and something a bit different; if you're looking for high quality technical climbing it'll be a bit of a disappointment.
I see one commenter didn't like it, but they also say they didn't actually do it!
"loose, stinking, minging, freezing cold and soaking wet cave where it feels like you might catch some sort of haemorrhagic fever"
- I don't remember it being worryingly loose; I'm anosmic so can't comment on whether it stinks. The cave's muddy. It may well be cold and wet, but I didn't catch any sort of haemorrhagic fever!