Hi Chris, thank you for coming back to us! Sincerest apologies for any confusion here.
When Netflix is added to your VM services as part of your package you should receive an email within 24 hours which includes an activation link to register your Netflix subscription, and choose which type of plan you would like (standard or premium).
If you fail to register from the initial email you should then receive reminder emails, and an email from Netflix after 7 days.
We are aware that some customers have reported not receiving this email, however, in many of these instances they have been able to resolve the issue activating the Netflix service via their My Virgin Media account.
If you log into your account you should see a 'Netflix' tile, with an 'Activation button' (screenshot below for reference.)

If you have not received any activation email please check your Junk and Spam folders.
Failing this please check the My Virgin Media account for the Netflix tile / Activation.
If neither of these options appear or work for you please do let us know and we can investigate further for you!
Hopefully this helps! Let us know how you get on and if you have any further questions or concerns.
All the best!
Molly