Looking for old science fiction show, possibly from the UK

I viewed part of this show in the late 80s and early 90s. I remember only a few details of this film.

I remember that the characters wear white and in some cases, wear a cape.

The other characters are suggested to be the bad guys and wear darker or more drab clothing.

The good guys seem cleaner and better groomed; the bad guys seem less groomed.

In one scene: a woman is in room, possibly a cell. A man walks in; she trips him. As she seeks to overpower and pin him to the ground, it seems she recognizes him. They work together from that point.

This film is science fiction or science fiction fantasy.