poita said:

I got the densitometer out to ascertain the best gamma and light balance settings for the scanner, so at least some colour has been recovered.

I'm finding that your custom LUTs have make this even easier to correct for the closest, original colors. In the test I'm now trying (your last reel3 LUT capture), my tweak has been reduce to strictly gamma (in the paint program) -- R=1.4 G=1.3 B=1.1 -- for an improved by-eye correction. That reflects just how close your capture has come to being it's own color correction. Well done!