@PeteJC, i did a quick test, load your pic with the sidecar-file and tried to follow your description on a calibrated screen.
The edit is quite dark, due to vignette and tone curves, the histogram is located correctly and the pic looks dark but fine.
Then i sent it to my standard printer, to see, if there is a big difference.
Result: contrast on screen was more visible. But the print was the same level of brightness like on screen.
Thus i guess, there could be a inconsistence in your settings or hardware-pipeline.
Hth.
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