Re: @Mr C Hill - Batteries!
Glue uses the same principles.
So do a few strips of rubber sponge.
But I take it, from your still-in-use Amstrad, that you go shopping rather rarely.
Har. Actually I have a more modern example in the shape of an Asus TF201 with cracked sensor glass. Only reason I haven't replaced it yet is that it still works. As and when I do replace it (IF I replace it instead of turning the device into a low power, silent test server thanks to the complete LAMP-like stack you can get for Android), I've done some research. The screen is not glued to the sensor. 50 quid including parts, labour, collection and delivery, which while not exactly pennies, is a damned sight cheaper than the cost of a new device.