With the power of Youtube, Screengrab and free photo hosting, I can show you pretty much an s7 with identical damage and from what the video poster says similar circumstances.
My screen has gone on pretty much exactly the same point next to the home button - whilst it was also on charge at the time. It wasn't even switched on. It was fine when I got in the car - not fine when I got out 15 - 20 minutes later.
Neil, For someone to manage to accidentally damage the glass in this location and from underneath would be quite difficult and probably impossible without some telltale sign of impact to the sides or back. Other then a tiny single spot of paint peel on the top my phone is (was) perfect cosmetically. The report I saw for the screen cracking was from a post where the phone became so hot it melted the cable and charger port. Mine hasn't been that bad, but repeatedly high heat cn gradually weaken the glass. I think that's what happened to mine.
JJ I'm strongly reconsidering CPW. They will slow the repair down and their policy is to claim accidental damage when a customer shows the phone in store - even before the phone has been looked at. But as you say, the consumer law is weightier then the warranty.