Okay, so Audi UK were hopeless on phone when asked for "someone technical" to speak to about what may have caused the issue with my car.
Hamilton Audi however were much more interested, and took car in for diagnosis, confirmed a low compression in one cylinder, and my car is now repaired. The report suggests an inlet seat has become "misaligned", although I believe this should say exhaust ... unless the valves are so close together that the exhaust valve was fouled by the inlet..however I was unable to view the parts, and didn't want to push the matter in the circumstances.
It has had a new cylinder head fitted, with associated gaskets etc and fluids replaced. Suffice to say Audi made an exceptionally generous contribution to the repair.
I am mightily surprised and delighted , despite knowing the car is impeccably maintained and completely genuine, it is over 6 yrs old, with only partial Audi history (albeit having 7 recorded services in 69000 miles, and being sold to me as Approved Used with non Audi stamps in book at 2 yrs old) . I had no prior experience of Audi Hamilton, (new branch) but will certainly endeavour to put some business that way in the future.
I am still disappointed that the fault developed, and am undecided whether the car will remain the "keeper" I had in mind for it, but fingers crossed it is at least back to good health and will be used daily for a month or so to ensure it is in fact fully cured.
Thanks to all who offered suggestions and support.
I do have an intermittent parking sensor fault to address now....anyone got phantom black front outer sensor lying about..??
Cheers, Iain.
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