In reply to Jon Stewart:
Whiskey Galore and Titfield are likely to be minging following the recent weather. Obvious choices are things like Pommel, Acme Wall, Ritornal, Rotifer, Successor State (not done this but it looks brilliant if highball V6 aretes are your bag) - be careful of damp top outs on some of those.
I'm sure there must be more/better out there though.