Red Magazine has a 20% off voucher this month (one with a free book) for their shops/concessions. Or RED4 online.
Except it's not for their Signature line - so theRed Davina Dress I had just bought for a wedding next weekend is still burning it's full price hole on my credit card (would have returned and rebought IYKWIM)
It's going on ebay afterwards if DS doesn't get his sticky fingers all over it.