Generic response from Goodyear:
"Thank you for your email,
I have attached a file on tyre wear ,
Our passenger tyres are warranted for 5 years from date of manufacture or date of purchase if proof can be shown. The warranty covers manufacturing and materials but not accidental damage natural wear etc caused during use.
We offer a tyre inspection service for any tyre dealer or member of the public.
Tyre dealers can send tyres back for inspection if they have an account with us. If they do not have an account the return can be made through their wholesaler who will then arrange to return the tyre here on their behalf.
Should we during our inspection offer an allowance it will be % based and is worked out using the remaining tread depth of the tyre. We then advise the recommended allowance to the account holder by letter. We also send a letter advising you of the results as long as your name and address have been included on the complaint form that dealers raise. If the dealer has no forms they can obtain pads from the BTMA on 0207 457 5040.
The allowance will be made to the account holder who returned the tyre to us. It will be based on their purchase price of the tyre from us. Most dealers will then normally reflect that allowance back to their customer based on their payment price should of course the tyre or a replacement tyre have been brought from them. You will need to speak to your dealer regarding their complaint tyre policy and allowance reimbursement to yourself.
If no allowance is offered on your tyre we will hold it for 14 days. The tyre will then be disposed of. Should you require your tyre back you will need to arrange for a carrier to pick it up within the 14 day period. The return cost would need to be covered by yourself. Carriage costs from the account holding dealer to ourselves are covered by us regardless of the outcome."
So the tyre dealer would get the refund not me! And assuming they pay somewhat less than the £35 purchase price, they'd get about £15 quid back.
I'll content myself with not recommending them to anyone, that should cost them far more...