Just a little update on this...
The knee pain itself seems to be better (other than I still can't kneel comfortably on either knee now, ah well) but I still have this ever present discomfort in my anterior shin below the knee
The new cycling physio isn't sure what the issue is, not related to the knee but possibly a tendinopathy or compartment syndrome, so I'm back off to see the knee specialist on Saturday to see if he has any thoughts.
I do have very tight calf muscles and stiff ankles which might be to blame, I have exercises to do to try to relieve this. I also got a foam roller, but not being able to kneel makes it very difficult to use effectively, and the tendonitis in my right shoulder and trapped nerve in my left hand make it hard to support my weight while using the foam roller!
I've had my bike position (set up is fine) and pedalling assessed which is all ok. I don't activate my glutes adequately while riding and my core stability is lacking so again we've discussed how to work on this. I'm going to try some SPD-SL pedals/shoes to see if the stiffer soles relieve the foot pain I also get
I am managing to cycle 70+ miles a week but not especially comfortably...if one thing doesn't hurt at a given time, something else invariably does (probably not helped by my bizarre tumble off the bike last week)
All good fun