Just seen that the inks for the HP CN245B which has been featured in this deal (http://www.hotukdeals.com/deals/hp-cn245b-photosmart-wireless-e-one-printer-35-99-delivered-amazon-uk/896285) are on a special offer at Tesco.
Black - 1 is £7.97, 2 is £11.95
Yellow - 1 is £9.14, 2 is £13.71
Cyan - 1 is £9.14, 2 is £13.71
No Magenta deal and they can't be mixed, so not amazing, but if you like your inks genuine, then probably the best price going at the moment.