White Clouds are easy to get a hold of over in the UK. They are a nice fish with a peaceful nature and pretty damn tough too. I love the red tails on the fish, and a group of them can look brilliant in a tank.
Try to keep at least 5 or 6. I think the more of them the happier and more lively they are. I have 7 in my tank at the moment and they are always livley playing in the current of the filter.
I think they are pretty easy to breed too although i haven't personally tried it myself yet. I think there is a good link somewhere on this forum where someone explains it step by step.
Anyway your local pet shop should stock them. What do you plan on keeping them with?