So on chat with Apple. They originally were going to a do a send out, hold on CC, return replacement for both headphones. However the agent then cam back and said this wasn't an option as it had happened on both (could have if it had happened to only one). Now suggesting that I drive an 80 mile round trip to see a service centre. The headphones have 3 month of warranty left. Trying to escalate as it's not really appropriate to suggest that, surely?