Just a few more discount codes i found while rummaging online :) By the way I haven't tried these myself!
Enter SANTA for 15% off Urban Outfitters - Ends 30/01/2012
Enter CHRISTMASGIFT for 20% off Radley - Ends 22/12/2011
Enter FU20 for 20% off Forever Unique - Ends 18/12/2011
Enter DPXMAS for 20% off Dorothy Perkins - Ends 19/12/2011
Enter ASOSGRAZIA30 for 30% off ASOS - Expiry Unknown
Enter DB2U for 10% off Debenhams - Ends 24/12/2011
Let me know if you get any bargains :)