Couldn't find it posted before...
Orange are doing a contract which costs £15 a month, which includes UNLIMITED texts, plus anytime 100 mins. You can also take advantage of Orange wednesdays (BOGOF cinema tickets) and free cals to your magic numbers.
Quidco says £60 for new contracts on Orange
Whole load of phones for free with this contract too, nothing too fancy but a nice range of LG, Samsungs, Nokia etc
If you're a textaholic like me this is surely the best tariff around?