I've re-posted this deal as it seems good to me for a stop-gap solution inbetween contracts (see frst post)
Terms & Conditions
If your tariff includes unlimited calls, texts, web & data, a fair use policy will apply, monthly data allowance 500MB. iPhone tariffs include 1GB of data.
Unlimited and flat rate calls and texts are to 01, 02, 03 and UK mobiles only, chargeable calls/text to these numbers are 25p per minute.
SIM Only: rolling contract.
Other network phones may be locked - see tescomobile.com for unlocking details.
08 maximum call cost 20ppm. 070 personal numbers maximum call cost 50ppm.
Existing customers call 2708 to switch tariff.
Payment by monthly Direct Debit. See tescomobile.com for terms and full price list.