Watching
Star Maidens (1976).
How timely as well.
Dystopian
and British you say?

I know I often say this, but I haven't quite seen anything like
this ahem.
A new planet enters the solar system, bringing with it a new civillisation.
What follows is a tad uneven, but am just enthralled, yes it's a tad wordy, but the Earth bound sequences are a laugh riot so far ....