They now have a cheaper sim only deal at £4.95 a month.

500 minutes
500 texts
500MB

http://www.uswitch.com/mobiles/sim_only_deal/e0738abf0449b23d6d1b419942188e31012...

Quidco offer cashback on all Uswitch Life Mobile deals.( £5 on this one).

You can set a smart cap on all Life Mobile Deals , that’s the amount you can spend over your line rental, at £5 or more   What’s smart is that if you reach this cap then you can keep on using any unused minutes, text messages or data in your monthly allowance without worrying….

So this deal could be capped at £5 including your rental.