Lyn & Heenan, I would go along with both of your comments, thank you.
It's early days for me, and waiting on an OPD appointment with my Urologist, but my initial feelings are to put the prostate on active-surveillance, and in the meantime sort out the diverticular disease. Reason being that quality of life is important and the diverticular disease is a daily misery, and my partner continues to cook to suit my bowel.
When I first saw my surgeon for the DD he said low fibre diet (yes white toast!) and exercise as if you're going for the olympics.
As the prostate Ca is intracapsular, with no lymph node involvement, I want to get the bowel sorted first.
Thanks, you have both confirmed what I suspected.