Hi Nigel,
A 55g prostate is quite big and it might not be anything significant. A suspicious 17mm something could also be not significant. Your psa isn't that high. That's the good side. The bad side is it could be significant so I can well imagine you're worried.
Without knowing a lot more it's hard to say but my thoughts would be to ring anyone I could find which might include the GP, Prostate Cancer Nurse, Urology, Macmillan until I got an answer I wanted.
I know it doesn't always work.
Also I doubt you've seen a consultant yet. I've seen a lot of doctors and some of them aren't that great so a second opinion might be useful if done tactfully.
The answer I'd want is where can I get a template biopsy in the next few weeks. I know they're busy but they keep making calls about 'where are the patients'. The number of people qualified to do template biopsies is more than those qualified to do prostatectomies. Urologists won't be doing Covid, although the nurses might.
Also I don't know if you'd be willing to consider private treatment or if your hospital will accept a private diagnosis. Private work can upset some hospitals so it might be worth asking your doctor.
I don't think it's about safety. The hospital should have areas that are safe or there should be hospitals that are safe areas. Granted it can't be as safe as normal if people can have Covid without symptoms but life is meant to go on.
I'd get on that phone today as weekend is no good.
I have rambled on. Hope it makes sense.
All the best, Peter