I got my Lipo's from here (these guys were so quick, ordered it on a wednesday night, turned up thursday morning no extra cost)...

http://ElectriFlyer.co.uk/

One of these would cover all your power needs assuming that you draw the same amount...

http://ElectriFlyer.co.uk/gens-ace-5s-3300mah-30c/

As for charging...

http://www.ebay.co.uk/itm/Turnigy-Accuc ... 1628wt_905

This will charge Lipo's,LiFe,NiCad,NiMh and Pb. Full balance charging, fast charge, standard charge, storage modes and discharge. Easy to use to. Only thing is that it comes with a US plug so you would need an adaptor or just cut off the US plug and fit an UK or EU plug. Simple