Instructions:Found this on the Barclays & Me website (a discount website for Barclays Additions customers).
Homebase are pleased to announce that there is an exclusive 15% off weekend on Saturday 17th January and Sunday 18th January 2009.
Go in store with the voucher attached and browse the fantastic product range available. Whether it is a brand new bathroom or fitted kitchen that you are looking for, Homebase can cater for all your D.I.Y needs.
Download the voucher from http://www.youatwork.co.uk/Share/Files/HomebaseVoucherDecember2009.pdf
It asks your for some staff identification - however as Homebase have offered this to Barclays additions customers I doubt very much they will ask for this.