My mother has bowel cancer. In the last few years, she's had colon and kidney cancer, and was diagnoised last december with liver cancer.  Fortunately, the cancer was very small, so they caught it with plenty of time, and she was due to have it removed in March. But on the actual day she was meant to have the operation, the surgeon then stopped it!  He said that due to her memory, he strongly suspected she had dementia, and that they couldn't operate until she had been to the memory clinic to determine her state of mine.  Bear in mind that this was right as the corona-virus was starting!  

Needless to say, the NHS is in shambles at the moment due to the virus.  I've been calling our GP who agreed with me that the surgeon should have done the operation regardless because things like memory clinics are hard to do right now. She said she called the surgeon and discussed it with him, and said that he was meant to either call us or her back within the next day.  I waited, but he never called, so I called his secretary just now, but she said he apparently wasn't meant to call either of us!  So then we started talking, and in the end she basically said what the surgeon first said, that he couldn't operate until her state of mind had been determined!  She said she would contact our GP again after she talked to the surgeon, but obviously he's busy with surgeries and other things due to corona!