Well, I didn't get to see Nan after all. She's been in 'end of life' care for the last month and dad was even called in to say goodbye last week as they thought she was fading rapidly. Because of that she's been allowed to have visitors at any time with no booking. Even so, dad called this morning to let them know that he, my mum, myself and my sister would be visiting her this afternoon and then we drove over (about a 50 minute journey). We got there, did our covid tests and then dad was called to one side and was told that the doctor had that morning taken her off 'end of life' care and so she was no longer allowed multiple visitors and only one of us could go in. I let my sister go as she was the first grandchild. But she is now only allowed two visits per week from one designated person, which will obviously have to be one of her children. So it's back to not knowing if I'll see her again, now.
I have sympathy for the fact they would have gotten in trouble had they let us in against the rules but they knew we were coming and also, to be blunt, saying she's no longer at the "end of life" stage is ludicrous.