I was told about this http://www.quidco.com a couple of months ago and I thought I would pass it on here to anyone who doesnt already know about it. The basic idea is that when you want to buy something online, search Quidco first becauce if one of their sponsers sell what you want they give you the referral fee. Quidco only charge you the first £5 of your bonuses in each year. If you dont buy anything then you dont pay them anything. I just switched my gas and electricity supplier and got £62 and I'm about to switch car insurance and get another £40. Most general purchase like DVD's or games will only get you 5% of the value back but the odd insurance policy and washing machine will soon net you some nice savings.
Just thought I would pass it on since I've saved £100 which has paid for a nice v+ cable box, the one with the built in hard drive