Hi, Isn't it normal to have hormone treatment before Radiotherapy. That could perhaps give you a lot more time to make up your mind. I was offered hormones at one hospital and RT at another. There might also be a question about which hospital has the best equipment, although I'd expect Guys to have as good as you get, not that I know.
For me getting the tumour out asap was the big factor so I had the operation. With a bit more knowledge I think if it had been near the bladder I'd have been asking if RT would be better if it has a wider spread of treatment, on the other hand that's just my unknowing thought. I think the mention Gleason 4 predominant would move me towards surgery.
The other thing is I was told not to associate every ache with the disease as it is likely not to be associated. Easy to say I know.
Best of luck