Thought I'd bring closure to this.
on the 3rd visit in 18 months to have this knock resolved I have been knock free for 2 months!
1st visit, spring and it's seats cleaned as a previous customer had similar problem but caused by a stone being trapped - knock still there.
2nd visit, under panels removed from below engine and under body removed to check for movement of any components - knock still there.
3rd visit, below engine panels removed, large jemmy used to lever all suspension components and check engine/gearbox subframe mountings - result quite suspension.
When I say quite there is still the unsettling crashing and shock waves shuddering the whole car when hitting transverse road defects and minor surface defects.
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