In reply to PaulJepson:
"it seemed like it might have the potential to be a bit of a wet moss greasefest in a rainy winter but I could be wrong."
It definitely does! TBH you'll always find a dry line or two, and its been fairly dry this week, but I'd expect the crack lines on the main face to still be seeping. But if you drop you grade expectations, I'm sure you'll be fine.
Post edited at 14:49