I noted on yesterdays threads an article re Virgin mobile and claiming cashback, etc.
If you are a Virgin Media customer, you can get a Virgin SIM card with 300 (anytime) mins and 300 texts per month for only £10. The contract is only on a monthly basis, so you can cancel with just a months notice. Also any unused rool over to the next months (up to total of 600 mins or texts).
I've been with them since March this year, and have got one for the missus, as she had a cashback contract, and then didn't bother claiming it back!!!!