As you can see from the photo above, disassembly continues. As I go, I'm still doing major surface cleaning, focusing most on the rust. No dramatic results to report so far, just plugging away at it and applying liberal doses of elbow grease, although you can start to see a difference on the handlebars.
After checking prices on new Brooks saddles, and confirming my inability to buy one just now, I've decided to have a go at resurrecting the original. The left photo shows the before condition, the one below shows how it looks after liberal doses of saddle soap and neatsfoot oil, more of which will be forthcoming. It's actually not looking too bad, although its age and general decrepitude are still obvious. It should be serviceable, however.