As the title says, two 12 Month XBox Live cards for £50.28 at Marshall Ward, with the £30 off voucher and a further 6% with Quidco.
This is the best deal I can find on them, working out to £25.14 each - nearest I could find was £28 from a PlayTrade seller.
I know the retail group can be a bit shady with vouchers, but this is legitimately my first order with them so I'm not too worried. :p
Hope this is of help to someone else, and if anybody has a better deal, feel free to comment!