Hi David,
i can’t seem to reply to your DM anymore.
You sent me a message saying the email address with the + sign had been removed, so I re-registered with a standard email address and I still have exactly the same problem.
On any device, on wifi or not, after clicking the verification link it says “complete your profile” but there is nothing to complete, and then a few seconds later it says verification link expired.
I think the problem might be that the email address that I used to sign up for virgin media was previously used many years ago, so I’ve been trying to sign up for my virgin media with a different email address. Perhaps they need to match?