My first post.
pxyzyzygy, I actually remember that TV drama...screened about 1971 or so in GB.
The main character was Kenneth More I think, who was a TV producer in the England of the seventies after a nazi conquest.
Things had settled down, but the Jews had gone and life was grim in most of the country except for people like the More character who prospered under the Germans.
It was a very low key understated drama largely set in one building, and covered Mores slowly awakening realisation of what the regime was like. No Germans even were portrayed and it ended with an act of rebellion by More, and the Sipo hammering on his door.
Very depressing drama, aznd sad violin music playing in the background most of the time.