Last week the felt-like backing started to come away from my Type Keyboard (v1), only a little and right at the back in the middle, a little double sided sticky tape that was cut to size and placed with tweezers seems to have done the job at holding the material to the exposed metal well. It seems on mentioning this to a colleague that they have they same problem as well with their type keyboard, so maybe it is not uncommon.
It seem that the new generation of keyboards (v2) have a plastic backing so should not be prone to this, although I am not too happy at the prospect of having to purchase a £100+ keyboard just because the backing has come away. Although I have seen the v1 keyboards price falling under £60, as well as the type 2 keyboards if your willing to look around on the web and have them imported from the US.
Andy