Update 6/10/20 - Peter Wayte from Goodyear technical advisor called to say that they won't pay anything out unless they have the tyres for inspection.
This means every time there is an issue someone, i.e. the consumer, has to remember to retain the tyres when they are changed and find somewhere that will send them back via the dealer network, not all places will. He has kindly (!) resent the test reports from the previous tyres which only states "The tyre shows clear evidence of having been used over-deflected by overload, underinflation or a combination of both". This does not clearly state what happened just that it isn't a manufacturing issue, which translates as user error.
He responded to my comment about failing on the inside shoulder that "Where a vehicle is set up with a negative camber more weight is carried by the inside of the tyre than the outside. Under the circumstances if there are load or pressure issues this is the area most likely to show it." I still don't buy this as this would surely show as uneven tyre wear.
For me there is also the question of Audi having OEM wheels and tyres that result in premature failure of the side wall despite there being a tyre monitoring system. If the system is not granular enough to detect low pressures in an OEM tyre contributing to its failure then some culpability rests with Audi.
Answers on a postcard please, but I'm considering my next steps are Citizens Advice Bureau or the small claims court. The Consumer Rights Act 2015 describes goods as being fit for purpose and lasting a reasonable length of time.
Email from Peter Wayte 26th March 2020 after last set were sent for analysis:
"thank you for taking my call and I was sorry to have to advise you no warranty allowance had been recommended by our inspection centre. I have attached the letters which went in the post but it looks as though the submitting dealer did not have your house number or name. The letters are addressed as information is submitted into our computer by the dealer.
The examiner felt the tyres exhibited over-deflection. This is when a tyres sidewall can flex more then it was designed to do. After a while it can exhibit splits. This can either happen if the tyres have not had enough air in them, (we recommend checking the inflation every month at a minimum as tyre / wheel combinations will over time lose air), or by overload for example a vehicle is loaded for a journey with family, pets luggage etc. If the vehicle manufacturer recommend higher pressures for such a journey inflating to these is required. The condition can also be caused by a combination of both.
I have also added below a couple of pictures for each tyre. Both sets of photos show the sidewall and also the beads. The beads are the part of the tyre which sits on the rim. Both beads exhibited some blueing which is a sign of heat build up and also grooving. Both blueing and grooving are conditions which would be expected to be seen if the tyres have had over-deflection from underinflation or overloading.
400710465
400710446
I appreciate that you are likely to be disappointed by this reply and can only suggest that if you remain doubtful about our decision, you seek the services of a recognized independent tyre consultant, details of which should be available from the British Tyre Manufacturers' Association, telephone 01787 226995. I must point out that we will only accept the findings of a BTMA approved examiner and that you must pay for the examination yourself in the first instance. However, if such an expert believes that your tyre contains any evidence of a manufacturing irregularity, on receipt of their written report we will gladly change our dealer advice to a 100% allowance on the tyre and refund to you the cost of such expert examination.
Under the circumstances and given the delay in you receiving the letter I have asked our inspection centre to now hold your tyre for a further 28 days from todays date (26/3/20). I have done this should you decide upon using a BTMA registered examiner. If you are requiring the tyres back for such an examination please as per our original letter, contact the Easy Tyre dealer who returned the tyres to us so they can arrange return to themselves."