Just bear in mind that if Tom turns up at a crag, no matter what the conditions he will climb!!!!
If you are going to get on supercede, I would advise taking a three step ladder to dry off the crux holds, also take a spotter, and at least three pads, its a little intimidating! My limited experience of climbing on the north coast is that its definitely worth going down and checking no matter what the weather is doing (if it is wet be careful walking down it can get hellish slippy). My advice would be get down to the block as soon as you can (after the tide starts going out), chalk and dry the holds (even if gupping wet), leave it for 1/2 hour and it starts getting pretty dry.
I would say Cornwall/Devon coast is probably the best shout at the moment in the UK weather wise, just remember the blocks get wet everyday so they do dry quick.
If you have a little bit of time down that way I would defo go check out Tintagel and Pentire, they are great locations and sum ace climbs.
WARNING: Supercede Sit is a KING UK line!!!