I decided to bite the bullet and attempt to remove the rear bumper from the '100'. I'm still doing body repairs (badly) and now have rear wheel arch repair panels so need to double-check that they are right.
The back-end is very rusty and I have a mind to remove the towbar in order to check for rot in the chassis rails (don't want 3.5 ton trailers coming loose

).
I was expecting trouble as I stood on the bumper a couple of months ago and was rewarded with a pile of bits on the floor!
I started by removing the tow hitch and spare wheel and chiselling away at the thick rust scale and loose remnants of panels underneath:
None of the nuts/bolts are going to come free without a fight and as I couldn't heat the bumper mounting bolts ('cos its plastic) I cut them off with a Sabre Saw.
The bumper then came off to reveal some horrors below:
The thin tin bumper support panel and a couple of filler panels have rotted away.
No probs - that should clean-up

:
The main structure - chassis rails and cross-member - have lost some thickness but are still OK to use (i.e. hit them with a hammer and they go 'CLANG'

) .
The towbar bolts are good and seized, but now I can see the captive nuts and can get some heat to them.
They'll be a lot of grinding-back to bare metal and metal prep to be done before this goes back together. This is now a long-term restoration project.
I'll be sending another parts order to Simon Holton soon

.
Hey -
Stuzbot - if you're reading this . . . Get that '90' chassis repaired, you have it easy

.
Tomorrow I'll see how the repair panels fit

.
Bob.