Patricia Bredin was the UK's entry in the first Eurovision Song Contest in 1957.
The pub sign "The Man With The Load Of Mischief" at 54 minutes 20 seconds was intact 14 years later and used in the September 1973 promotional video for Rod Stewart's "Oh No Not My Baby" (In colour)
The statement at the beginning of the film which says that the difference between Labour and Conservatives is that whilst under Labour man exploits man, under the Conservatives it is the other way round was used by the American economist John Kenneth Galbraith many years later when comparing capitalism and Communism. He has since been credited with originating the remark, but has said he was repeating an old Polish joke - so perhaps Sidney Gilliat was as well.
When Left, Right and Centre went out on general release on the ABC circuit in September 1959 it was supported by the Merton Park crime drama "Wrong Number" which starred Peter Elliot, who had a small role in Left, Right and Centre.