Further update.
I've noticed that the front tyre seems to have what can only be described as a weird notchy head bearing feel.
It's like there is a resistance to the tyre moving from dead straight to either side. It's only noticeable at low speed, but takes some getting used to.
Nothing wrong with the head bearings that I can detect when it's on the centre stand, wheel off the ground. MOT station didn't notice anything either.
Pressures are fine too.
Anyone else got this issue?

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only dead fish go with the flow..................