Not looking good I'm afraid, take your pick from coil packs, sticking valves or timing chain slipped, or all three even.
Booked in for recovery from my independent next week and transferring to a local(ish) VAG specialist for further investigation
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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
Audi TT - 2015 - Ultra