I was going to order the T-Mobile 18 months @ £30 with free N900 for 300 mins, 300 texts and data, but the price went up to £29.99 for the handset on this deal so I thought again.

Eventually went for the extra £5 a month for 700 mins and unlimited texts, free N900 and half price first month's line rental. Seemed the best deal to me. It's the Combi 30 + Web'n'Walk one.