Hi, here is an update for all those kind enough to respond to my original post.
My husband attended his 7-week post-op (da Vinci robotic) appointment with the consultant today, and was given the great news that the op had been very successful, cancer was still contained within prostate (which was a worry after such a long time from diagnosis to surgery), lymph nodes clear and vesicles clear, Gleason had been downgraded slightly to 7-7.5 from 8 and he doesn't need any radiotherapy treatment and can stop the hormone tablets. A bonus is that he saved one set of nerves completely and partially the other side. I guessed when he opened the conversation about erections and how he could come back from a demo about a vacuum pump that the news might be good (although you don't dare presume until it's actually said)!
He just has to return in four months for another PSA, and then every four months thereafter. He said he would only start him on RT if it reached 1 (which is apparently lower than the usual 2), but he calculated the odds of him needing to start RT within the next few years were quite low (rising to 30% over ten years).
I know there is no guarantee this will not come back but, after almost a year of worry, this news was a great relief to us both, and my husband near bounced out of the hospital with joy. The change in him is amazing - he feels he has his life back.
I had read beforehand that people with a Gleason 8 aren't usually offered surgery, but the consultant said my husband was a perfect example of it being the correct course of action, given that he is relatively young (62) fit and otherwise healthy man. He has also not had much problem with incontinence or anything else so, after a series of disappointments, when everything was always a bit worse than expected, it was lovely to have better news than expected for once - in fact, the best. We can't thank his surgeon enough. He did a terrific job, by all accounts.
I hope this gives confidence to other men facing similar treatment, and I wish you all well, and thanks for listening again.