Thanks for that Dave your a lifesaver , they have sent me a video showing the door remains as three sides , so that looks like the top rail fits into the rails bonded to the front glass. it looks like the hinges must still be intact as the door swings, so could be just the front glass they need, the back glass somehow was undamaged. The only thing i am wondering is if there would have been any loose plastic clips to hold the inner glass in the frame at the bottom , as i cant tell from the picture.
Thanks again,
Nick