Just checked it and......
Battery reads 12.6V when stood, ignition off.
Then 14.7 when the bike is on idle.
Then 20.8 at a steady 3,500 revs, and I suspect it just climbs from there.

I did notice the faintest bubble trying to emerge from where the battery was sealed after filling from new too.

Is this all a symptom of the regulator please?

If so can someone quietly point me in the direction of a replacement, Thanks again.
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if it had a tail - it would wag