This item I believe is mis-selling.
The exclusive offer is for TV Max.
What it does not make clear is that any other products you may have, have to be re-aligned/contracted !.
What it also means is that if you have bought in advance "Line Rental " then this will incur either you buying time monthly if contracts don't align OR buying another year at "possible" discount !
There is no gaurantee from BT that there will be any "Special Offers" ongoing at time of renewal or end of contract.
BT also note the costs of early termination !!!