Instructions:Had this come through in a mailing this morning for Additions. I thought it may be because I have a £0 balance and they wanted me to buy, but thought I'd try it on littlewoods which doesn't have a £0 balance, because I wanted 52 weeks interest free!! So far so good. The order has been accepted! Been waiting for a discount for a while.
Hope it works for others. :0)
Enter code XX770 at checkout.
No idea of an expiry, but I doubt it will last long!