Thanks guys for your suggestions. The v10 has 2x ECU’s and 4 banks.
I’m hoping to figure out how to read the fuel trim on VCDS hopefully understanding this will point the way to diagnosing the issue - it’s really frustrating when considering I did the carbon clean only weeks ago, the car then passed its MOT just fine then deteriorated ....
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Present cars
Daily driver: BMW e65 730d
Batmobile: 2006 S8, D3, 4E 5.2L V10 BSM with (loud) Miltek SS exhaust, Carbon Fibre trim, Alcantara headlining, soft close and keyless entry. 
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