Thanks to all for the invaluable assistance.
I've just returned from Somerset and although I didn't see any puffs of smoke, I did smell something when I parked the car up just now. I'm sure it's not a coolant leak as I've only recently had the aluminium oil cooler union/connection fitted to replace the stupid plastic OEM part that cracks. My old A8 certainly had the issue with fluid dripping on the catalytic converter but this current problem doesn't smell quite the same though.
Some of you may already be aware that I had some rough-starting recently with an O2 sensor code but this hasn't come back to haunt me yet. Lumpy idle is still being experienced for the first 2-3 seconds after starting her up but it settles down to a solid 650rpm or thereabouts.
MJ's comments about cam cover gaskets / cam tensioner gaskets sounds likely -
I will allocate some time this week to pop down and see DS Autowerks in Crawley.
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend)
2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend)
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