Thanks for your suggestion. It hasn't made any difference using Microsoft Edge as to when I previously used Firefox. I still can't register for My VM. I wanted to use my longstanding email address "xxxxxxxxxx@blueyonder.co.uk", and when this didn't work I have tried to use "xxxxx.xxxxxx55@virginmedia.com" and "xxxxx.xxxxxxxx55@virginmedia.com". A few times I've got to the final stage and then the screen tells me:
We are not able to set up your my Virgin Media account at the moment. Please try again later, or you can also set up your my Virgin Media account at the time of your broadband installation. We are looking forward to connecting you to your superfast broadband."
I've had this message many times in the last 6 months, so I keep trying.
Any other suggestions, please?