well that wasn't so hard after all, just time consuming.
I've just replaced the floor in (muddy)James's 300 tdi Disco. Pretty much all the edges had gone. I got James to get a replacement floor from Paddocks but a word of warning - it doesn't have the same reinforcements as the originals. Also if the floor has gone you may also need to replace the two extra support brackets - one had gone on James's car which I'm hoping a replacement can be found else I guess I'll be making one sometime soon!
If you do need to do it and want some pointers, let me know.
Matt