Well, fully armed with grinder, WD40, wire brush and lots of extra knowledge from friday I now have two new milner rear leaf springs fitted and looking lovely...and this side only took me 2hrs including cleaning up afterwards

Took the opportunity to wind up the front torsion bars at the same time as the truck was lurching forwards rather a lot, and leaning to one side by just over an inch.
Really pleased with the stilt-like results, piccies to follow, though do now have even more of a camber issue (question posed in suspension topic).