Found 25th Jul 2017
Tesco have doubled both the 4G data allowance (from 500MB) and minutes (from 250) on this tariff. Occasionally they double the minutes on this tariff, but I haven't seen both data and minutes doubled. I was an existing customer on an expired 12M rolling contract and was able to swap over the phone onto this new tariff. A great deal if you are a relatively low user and need to be on the O2 network for reception reasons etc.