O2 new sim only deal - £20 for 20Gb 4G data + Unlimited Minutes/Texts.
Valid until 22/03
And if you have friends or family working for O2 you can have further 30% off the price.
20 x 12 = £240 (price for 1 year without cashback)
240 - 50 = 190 (1 yr price - cashback)
190/12 = 15.83 (factoring in the cashback, still the bill you will get every month will be £20 but you will get your cashback via Quidco)
And of course being an O2 customer means that you will have access to O2 Priority that has daily freebies and discounts including the £1 Monday lunch, O2 Wifi, O2 Chat for cheap international calls, and so on...
Now Quidco is only offering £45 for this contract, but Topcashback is offering £50.