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For something as specialist as an R8, speak to Ricky Elder at RE Performance. Various videos on YouTube on the horrors that can unfold on poorly maintained examples. They don't sell cars as far as I'm aware - but can point you in the right direction I'm sure based on budget.

try autodoc,they keep a huge stock of parts and lot of original audi parts,Greg

Evening folks, so might have made some progress tonight. On the drive home I was monitoring and recording live data for various sensors. My wife was in charge of pressing the “flag” button if the fault happened. This time it did happen and sure enough poised like coiled spring my wife hit the flag button. When I played the recording back, at the point that was flagged there was a dip in both the cam and the crank sensor readings! So I nudged the readings frame by frame until I got the frame before the hesitation the frame at it and the frame after. Luckily I was also monitoring crankshaft signal status as on the frame before and after the hesitation it’s reading is GAP FOUND but at the point of the hesitation it’s reading is WAITING GAP. I’m not going to get over excited for now. However, at least that gives me a starting point. I’ll remove the sensor and check the ring and flywheel condition as best as I can and then I’ll order a genuine sensor from Audi. I’ll run the car for a week or so and then I’ll come back with an update. I’d say this rules out a fuel issue, if it was lack of fuel I would still expect it to see the gap for the crank sensor. The only other possibility I can think of is that something is switching the ignition off for a split second but how unlucky would I have to be for that? (I do have a lot of bad luck to be fair). My only slight worry is that it’s visible on the graph for the cam, in my head I can make arguments as to why it would and why I don’t think it should be visible on both graphs. But let’s start with the crank sensor and take it from there. very sorry for the extremely long post, I’m not on many forums, I think they are a great source of information and I’m trying to be as informative as possible. wish me luck 🤞 Davie 👍