I noticed that Talk mobile are offering a 1 month rolling contract with 100 mins and 100 texts which isn't particularly great but then i went onto the Quidco website where it says £50 cashback for any pay monthly contract. The T&C's say nothing about excluding 1 month contracts so this could be a free £42.50. Try it for yourself.
Contract Link: http://www.carphonewarehouse.com/mobiles/pay-monthly/tariff-deals/TK75S
Quidco Link: http://www.quidco.com/carphone-warehouse/

£7.50

www.carphonewarehouse.com