After doing a bit of research, this is the plan for replacing the carpet:
1.
Remove all material back to the painted metal, keep existing tar-backed sound deadener for the moment.
2.
Vacuum and clean. Wire brush/flapper disc surface rust where required. Wet and dry sand. Wipe down with oil, wax and grease remover.
3.
Touch-up with Galmet Keytite Steel Primer where needed (hopefully don't have to do too much of this!).
4.
Small patches of self-adhesive Butyl Based Sound Deadening Material in the middle of large, flat surfaces that can vibrate (i.e. under the front and rear seats only).
5.
Closed Cell Foam (EVA or equivalent), glued to the floor pan with as little adhesive as possible; just enough to hold it in place (perhaps not required?).
This replaces the felt attached to the tar board.
6.
Vinyl sound barrier; glued to the closed cell foam.
This replaces the tar board backing.
7.
Underlay (Knox carpet).
8.
Carpet (Knox carpet).
There may well be existing stuff that I can reuse, so perhaps the above gets used only in the rear where the vermin made their home!
J
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