Topcashback is a cashback website. They will basically pay you for shopping through their website.
Once you sign up you can view their list of retailers, which includes stores like Dixons, Currys, Bennetts Electrical etc. If you want to buy something from Bennetts, click on the Bennetts link on the Topcashback website then make your purchase as normal. After the transaction has been confirmed you'll get 4% cashback in your account (this varies between retailers). You can then redeem this as a cheque or direct into your bank account.
It's great and I think it's the highest paying cashback website that doesn't charge an annual fee! There are others, such as QuidCo, but they charge a fee for using them (and you won't get any more cashback).
Sign up here...