Instructions:Actually got this through work (along with a free delivery code which I'm posting separately).
Enter PHZP at the checkout
Offer excludes beauty and fragrance, furniture, handling and delivery charges, gift vouchers, giftcards, personalised wedding stationery, wedding gift lists, flowers, hampers, wine, Sonex, large kitchen appliances, selected electricals, selected concessions and financial services, or in payment of any outstanding balance on your Debenhams account. Items must be purchased in one transaction from Thursday 23rd – Monday 27th September 2010 (inclusive). To claim your discount type your offer code into the promotional box once you have added the item(s) to your shopping basket. The offer cannot be used in conjunction with certain other discounts, offers or staff