Had a go at the handbrake adjustment again today.
For a start, my truck started on glow plug only (no engine start spray) and moved to the grass so the commy could get good working space close to the tool box, so that was good.
Adjusted the lever way off too. Factory spec is about 20mm of thread showing, whereas this was easy double that.
Wire wheel on the battery drill, hammers, brakleen, etc etc and RH rear disc was off.
Pulled shoes off, and pulled adjuster pistons (or whatever you want to call them) out for a good clean and re-lube. Reassembled and adjusted until the disc was just shy off touching to go back on (to minimise adjustment through the stupid little hole), adjusted to around 5clicks on the lever. Caliper and wheel back on - then full repeat on the other side.
Adjusted the cable at the lever end to take up the slack. And then adjusted a fraction more so that 3 clicks on the lever holds the car when in drive and your foot off the brake.
Yeah it was an easy 3hours (at a guess) because of stubborn discs. But very satisfied with the result in the end.