I think mine's a 6s. I went to the Apple store in Stratford on Wednesday, they told me I needed to wait in the "genius" queue outside the store, after a wait of 30 mins I was told it would be a 4 hr wait for an appointment. Just as I left the queue a woman who was joining teh queue was told "why don't you just download the apple shop app and book through there?"

Thanks for letting me know!

Thanks for the links Andy, whether it's a warranty replacement or not that seems a good deal.