Try Supermarkets, Call centres, or get in to somewhere like Currys/Comet - they may not be the best jobs in the world but are generally higher paid than normal shop work. Electrical retail isn't based around commission anymore, it's a different bonus structure - but it pays quite well for doing, say 10 hours a week.
I know for a FACT that this outfit are looking for people for various programmes because my mate works for them. 2 years ago I helped him out and got £800 tax free.