Oh well, its academic now anyway - I made enquiries yesterday, and was contacted this morning, the lady I spoke to wasnt the manager, and she had to check with her. I've just heard from her again, and the manager has said they couldnt rehome a kitten with me due to the number of cats I already have - RSPCA policy (5 other cats would be probably be ok - but 11 wouldnt!) - sort of expected it really. Funny though, Cat Protection were happy to rehome an elderly Persian with me a couple of months ago, sadly she died before I could take her on.
Apparently, 3 have been reserved and there are 3 left.