Learned something new today about AUDI misfuelling

Did a fuel drain today on the M23, an Audi allroad had been fill’d with 20 pounds of petrol (it was a diesel) and driven for 30 miles, the car had died and I got call’d, I did the standard drain & flush and went to re-start it, it wasent quite as easy as it should have been, and given the distance it had been driven I suspected major damage, I got some over the phone advice from an AUDI specialist – (turnd out that  driven on wrong fuel audi allroad V6 TDI has a peculiarity) well  I’m not too proud to admit that I don’t know everything there is to know about every car ever made, – and after some specialist advice on an unusual case – the car was up and running again with no further damage, and the customer was on his way, it’s worth having a few experts on hand at the end of the phone, and since its normally me dishing out the technical advice – it was a nice change (I made that all up, the truth is I was kicking myself – I make about 2 calls per year to other mechanics and I really could have done without that one because he will never let me forget it – )