Just bought myselft 2 x 2100 points from Littlewoods for £25.02. Just order 2 and then use code ZQ220 (supposedly works for exisiting aswell as new customers). I realise that there can be issues when using Littlewoods/Marshall Ward/Additions etc etc codes but I personally have never had a problem. Don't forget quidco.
Xbox Live 4200 (2100 x 2) Points for only £25.02 Delivered @ Littlewoods plus 8% quidco