Re-contracting & free Netflix

My current contract is due to end in a few weeks, and was taken out before the start of the free Netflix offer.

I have been offered a fairly reasonable new deal through my account page, which I’m considering taking, but I’m just trying to find out before I take the plunge  - if I press the “Grab Your Deal” button, will this automatically trigger the addition of Netflix to my account, or do I have to go through Customer Service?

Cheers in advance to anyone who can help :)