Had to choose French translation of Veryfrustrated as my user name as the English is perhaps unsurprisingly already taken!
I sent a cancellation letter using Royal Mail's 1st class signed for service to Virgin Media Sales Operations Support, Diamond Plaza, Daleside Road, Nottingham, Nottinghamshire NG2 3GG. This is the address for written cancellations stated in the latest Terms & Conditions on the Virgin Media website.
I check with Royal Mail's track & trace facility. Royal Mail's reply is Sorry, we were unable to deliver this item at 15-01-2022 as the recipient is no longer at that address. We're returning the item to the sender.
Please would someone "in the know" explain.