I know these Groupon and Living Social Deals sometimes get slated, but this seemed a great deal and at least you know what you are getting!
For £15, you get a code (sent this Monday, doesn't expire until July) to spend at Next online. Minimum spend is £31, delivery is free to store for existing customers).
Thought it was worth a mention, my kids need some summer bits, so it is effectively half price.
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You will be creating a credit account with Next if you use the vouchers