O2 Monthly rolling Sim, Unlimited min & text, 10GB (20GB w/volt) data, EU roaming £28 cashback // Get 30GB (60 w/volt) – £10pm

These are monthly rolling plans, so no commitment and you can cancel anytime.
Topcashback compare offering £28 cashback on both plan so first three months are free.
If you are Virgin Media customer, your broadband speed will be increased to next available speed and data will be doubled on your sim plan under Volt benefit.
O2 Priority included
How to get the deal –
Log in to Topcashback
Click Compare
Click Mobile
scroll up and click compare Sim only
Filter by O2 and it will be first two offers shown as below
o2.co.uk/sho150