One day we do plan to sell batteires/chargers and are working on it, but due to some postage restrictions and other factors like storage/ expiry of batteries we still need to work some things out.
Hobbyking do have great prices for batteries, and has for ordering with them it realy depends on your luck, but I think they get most orders correct, and if its from the UK warehouse they are subject to all of the UK selling regulations. So if ordering from them I would suggest only getting from UK warehouse if you want to have some sort of buyer rights, otherwise with international warehouse if you have problems good luck getting it sorted out Also I suggest you pay with paypal so you can at least file a claim if your order does not turn up.
As for a UK supplier I think that giantshark.co.uk are alright I think (they sell gensace lipos which are quite good). Anyone else have a favourite UK Lipo supplier?