At last! I can report something useful.
This is what we started with...
Bolts came out with no problem.
Consigned to the undergrowth...
Wrong colour coded "cheeks" removed from the replacement. Three barbed spring clips and it's off.
Original Epsom Green going on. Strangely, three barbed spring clips will do it!
No pics of the fitting, they're awkward enough without trying to wield a camera! But...
Looks a bit better. New lenses on the way as well.
Front? Next time. :) I may paint it tomorrow.
Having overdone things before in this heat, I'm pretty much attuned to know when enough is enough. As a general rule of thumb, when the fag packet in the top pocket of your overalls collapses into a mushy mess, you have now leaked enough fluids. Time to restock. So a soak in the shower, half a gallon of water and now on the cold ones.
Feet up time and contemplate half a job well done. :D
Ironically, I know from experience that the front is actually easier. Although heavier and no less awkward, there's no fighting for an hour with reluctant arch liners or mudflaps after you've fitted it to contend with.
So that's the worst behind me.