The restoration had to make some different color moves because the layers were either gone or quickly going. They had to spend enormous amounts of time to color grade and match period decor to boot.

The new BD uses the old 2005 struck master with some tweaking.

I'm still thinking HOD isn't right on either Warner DVD or the Hammer BD. The DVD was boosted and lacked color depth (one of those films I always tweaked in VLC) and the new version is too cold, especially in comparison with the other Fisher/Asher made Hammer classics of the period. It should honestly be a bit between the two I think.