Hi,
I thought I'd update you on my headphones.
I drove through to Glasgow after booking an appointment to speak to someone about my headphones. The team member I spoke to was very helpful and showed my headphones to his manager as he said the wording in their Ts and Cs was unclear. He came back and told me that Apple would send them off for repair or replacement, explaining that as they were still under warranty any costs would be covered by Apple.
I received an email later that week to say that my headphones were being replaced and would be ready for collection within a few days. I didn't need to make an appointment to collect them which was great as there weren't any available before the final collection date they gave me.
Having read others' replies to this thread, I was obviously dubious about how Apple would respond, however, I can't fault them. I've had a few issues with other Apple devices which have also been dealt with quickly and without question.
There are clearly issues with these headphones which is ridiculous considering the cost of them and I can appreciate others' frustrations. My advice to anyone with this issue (with the headphones being under warranty) is go into the Apple Store and speak to someone directly. If you're unhappy with the response, ask to speak to a manager.
I hope this helps.