Apart from the credits and occasional tunes from the background, there is absolutely no music score in the whole show.

Each episode was rehearsed for two weeks.

Kenneth More is actually two years older than the actor playing his father

The end credits say, "Music: Marcus Dods", but he only conducted the 'Eric Coates' (non-original) theme music.

Donald Wilson gave up his position as Head of BBC Serials in 1965 so that he could concentrate all his efforts on making this serial.

If Eric Porter had not played Soames the next choice would have been Bernard Kay.