Quidco is offering some good cashback deals with a very time limited offer in the case of Virgin - one day only now. iphone offer ends Sunday. I've used Quidco. No catch; it works.
Click pics to learn more.
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The cash back will take a couple of months to come through though. Was looking last night but their customer service is rubbish and you run the risk of not having access to the interwebs for a week (at times).