Hi Anthony,
I was in a similar position to you, I was diagnosed last November and had a lot of conversations with various health professionals, each one offered me different approaches to treatment options. I went away and, like old Barry suggests, referred to the toolkit from this site. After studying the various treatment options I went back to my oncologist and said which ones I would like to try I asked about brachytherapy, but this was dismissed as one of my tumors was to close to the wall of the prostate, I asked about hifu but again this was ruled out for the same reason. My only options were external beam radiotherapy or surgery. I decided on the surgery as I felt this was right for me. As for side effects etc, the only problems I've encountered have been incontinence (now dry after just 6 weeks)and ED, both of which can be treated. Also if you are at UCLH I would recommend attending their patient school for people considering surgery as it is a worth while presentation on the pros and cons of Radical Laparoscopic Prostatectomy. As for driving I was back on the road within four weeks after surgery, albeit for short duration drives, and now I am driving around without any problems (8 weeks after surgery). I know that as a taxi driver you would like to be back driving sooner rather than later but if you do opt for surgery don't try to rush back to driving to soon.
I hope what I have written has been of help to you but, again, as Old Barry said, do your research and make an informed decision that you believe suits you. However that said remember your oncologist has your best interests at heart and will only push you to a treatment they consider will give you the best outcome.
Wishing you all the best
Ants