Get Some F**king Lights

If it's AA or AAA then just get some rechargeables and a charger unit from Maplin which will cost about £20 and mean you spend loads less in the long run. If it's those little disc batteries then you can get about 10bn of them for a quid out of any old pound shop.

It's the little disc batteries. I can't think of any pound shops in central. I'll check maplin.