I think I'l manage, lol.
O2 have this deal. £1.99 per day for up to 25mb of data usage you only get charge the £1.99 on the days you actually use it. So if say (for example) I want to check-in on facebook, that's 1.99 for that whole day or, if I check in, check sky news, tweet a bit a dozen times on another day, that's still only 1.99.