Seems my Pico has a fault and has gone to Pico hospital, borrowed a friends and now have a clear picture of whats going on.
Blue trace is o/s/f wheel
Red trace is n/s/f wheel
Both earthed at battery
All images zoomed in.
Capture taken from ABS unit backprobed pins 5 & 9 whilst still plugged in
Running voltage observed with slight voltage increase just as Lee suggested, blue trace is dropping out for 20ms.
Hub replaced as one unit with confidence of a fix, old one had a considerable build up of rust between pickup ring and bearing.
Hope this post helps someone else
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