Watch FMovies. Alan Johnson MP (and former postman) tells the story of 500 years of the Royal Mail, and discovers how the humble British postal system changed the course of British history. Alan started out as a postman in London when he was 18, in 1968. He would eventually rise to become general secretary of the Communication Workers Union before being elected as an MP. So the post office changed his life, and set him on the path to parliament.