For £7/mth you get
2.5GB of 4G data on rollover.
You can choose to limit your bill to no more than £5 over the tariff price. Also you can roll your unused data over into the next month. So use only 1.5gb one month and you'll have 3.5gb to use the next. No need to choose one over the other now! Capping, eu roaming and rollover included in this package. Bit on the low side for minutes but most people don't use that many now
*officially no tethering but iD say it uses allowances quicker so don't support it but will not kick you off if you do
Plus £5.25 TCB making the first thee months £5.25 a month
*If you want more mins then the £7 month deal is for 500 mins