I purchased a 320gb PS3 using the Zavvi Outlet and Quidco voucher and cashback combo for under £200 including the cashback. The deal was posted on here and was very hot.
Anyway I see that Zavvi have a deal on a 4gb Xbox and a Kinect. If you go through Quidco and use the 10% voucher for the Zavvi outlet then this will be reduced to £198.
Now when it goes through on Paypal, you will see it has a payment sent to Zavvi of £220, but look at the breakdown of that £220. It should be £198 from your funds and a £22 voucher.