This sounds too good to be true and is dependent on Quidco and BT voucher paying out otherwise still not bad at £5/m
Quidco rates have updated today. Now £35 for all BT sim only plans.
ITunes Amazon voucher has to be claimed by you from BT (but you cannot claim until 14 days after activation).
The £8 Sim only Plan with higher allowances works out at a net £1 over the 12months if £35 Quidco and £60 Itune/Amazon voucher pay out