Swapped front drivers wheel for a spare and the noise disappeared (stopped totally).
The wheel I took off has a near new tyre, the replacement was my 3rd worst spare with the legal minimum tread (because that wheel was handy), but the tapping noise in sync with the wheel stopped.
Inspecting the offending wheel, doesn't show any distortion, no bulges/separations evident. The tyre looks all good, 85% tread.
So will take wheel to the tyre dealers, get them to strip it down and see what they reckon.
The noise might be from some sort of separation in progress that i cannot see as yet, as the sound has been slowly getting louder.
I once had a brand new tyre that looked round, was balanced, but car jumped like a pogo stick as your speed increased.
Thanks for help in suggestions.
And yes I know Graeme suggested swap tyres about first thing (thank you), but near new tyre and looked OK ???
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