Well I crashed :-). Couple of bits where I was carrying up and down steps that I could have cycled around, in retrospect. But, no, it was alright really.
Interesting to compare with other's routes
Mairi's (not all zones): https://www.strava.com/activities/4963025941?share...
And Jon's and Ross's etc
They mostly have smoother lines but I'm not sure that they got them all. Your route certainly got them all. And even cycled through one of the two new neutral zones that appeared after you'd ridden through... d'oh! Only a minor 100m diversion to get the other one, too.