Years ago, I registered a .co.uk domain for my mother using my own 123-reg account. I set the registrant name to hers as it was a gift for her and she would be the owner.
Time passed and she has since died. The domain is still managed by my own 123-reg account and I've set the email address and phone numbers to mine so it still has valid contact details, but I can't change the registrant's name.
I found this page on 123's support site. Do I perhaps need to ask the executors of her estate to go through the steps of creating a Nominet account as this page describes? What do I need to do to transfer ownership of this domain?