I'm going with "Nothing under 20". Not that I'd make a day trip of it for. Porters is probably your best chance but as Neil said (and it probably depends on how much wind there is and what dir), still probably not under 20. One or two crap things here and there at various crags but none come to mind easily. At Celebrity you might be able to climb the 18s, but they'd be damp, if not wet
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