Cheers Gents, I appreciate it's all speculation until I can get her scanned but at least I'm not miles from home. The plugs are recent as Ian changed them during his ownership but the scan will hopefully clarify the cause and solution.
Great input, I'll keep you updated
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Audi D3 S8 - 2007 - V10. B&O, Phantom Black, black and silver interior, and still completely standard with everything working as it should
SOLD 2023
Audi TT - 2015 - Ultra