"Cancer treatment delays"

My father had his first treatment of radio nucleotide therapy in London in August 2019, having been diagnosed with reoccurring NET cancer 3 years ago. The symptoms of his cancer is severe pain and fatigue. He has had to retire early at 56 years old as he is not fit to continue. As we are from Dumfries we were getting nervous as no date was through for next treatment. It is supposed to be 8 to 12 weeks for optimum results. Meaning next treatment was due in October.   The date we have had to chase exhaustively is now late November. All the staff are excellent and provide exceptional care, but this cancer is killing him and there are no more treatment options, can anyone tell me why there is such a delay? I would dearly like to know why my father is being put through such admin stress when he is fighting for his life. This is no little matter. Any help is gratefully received.