Although this film was based on a novel by a serving Labour Member of Parliament (who had died before it appeared), it was widely regarded by critics as none-too-subtle propaganda for the Conservatives, of whom the head of the studio was a vocal supporter.
Johnnie is frequently referred to as a back-bencher. Front-benchers, who sit on the first of the long benches in the House of Commons, are members of the Cabinet. Back-benchers are those who sit on any of the other benches; they are simply Members of Parliament and have no other position.
Emlyn Williams was offered a role.
Out of all 14 actors in the movie who played an M.P. Peter Sallis was the only actor who played an M.P. to go credited for his role while the other 13 actors who played an M.P. in the movie went uncredited.