@enoch85 & @szaimen All good again. It was by chance that the update happened more or less at the same time that the company who registered my hostname did something I don’t know what. I noticed later that it was their problem because in the tab of my Nextcloud login page was their name which was not correct. My DNS A record points to the ip address of my router so something wasn’t right so I simply deleted the A record, set it back up again and now all is well.
Nominet and 1&1 have been doing some strange stuff together, if you bought a .co.uk they would reserve the uk for you for 12 months, if you didn’t use the uk then it was put in the pool for sale. This all happened at the same time as the update but clearly not related.