I have read the british study too and was leaning toward AS with my 3+4 gleason, 12psa at age 78. But my tumor was at the edge of the prostate and the study says although 15 year mortality is similar, 76% of the AS group needed treatment during that 15 year period.
It's a very tough call, playing odds, and very personal decision.
I will start proton radiation and hope for the best. My friend did this 2 years ago and when i ask him how the side effects are, he says 'what side effects'. I hope we are all so lucky.