Well, this has still been ongoing! Took the car to an Audi specialist garage in Stonehouse, Glos. last week to see if they could shed any light on my predicament.
They hooked it up to a hand-held oil pressure gauge and the conclusion was that the oil pump was healthy and the pressure was seemingly very good.
Regarding the noise, it was not considered to be an hydraulic noise but more a mild case of piston slap, which is quite feasible I suppose.
Looking into how to quieten it down, I came across some stuff called Ametech engine restore.
Now, I'm always suspicious of these things and anything in the 'Snake Oil' category but I've given it a go as of last Saturday. The jury is still out as it will need time to see if it does what it states on the tin, but so far it's not too bad with a lot less noise.
I'll report back if it's any good.
Alan
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