It wasn’t the compression, it was those annoying jagged lines plaguing the video that makes me think somebody was asleep at the wheel when this was mastered for Region 1.
BBCWW North America just doesn’t care, unfortunately. They forgot to vidfire Moonbase (converted to progressive I think). They’ve put a good half of the range out of print while they’re still being made elsewhere in the world.
I would just import the blu-ray. The animation will look better, and the outdoor existing footage will be in HD.