Upon his return to civilian life, he began to write scripts for Jimmy Edwards. When Edwards teamed up with Dick Bentley on BBC Radio, Muir formed a partnership with Denis Norden, Bentley's writer, which was to last for most of his career. The vehicle created for Bentley and Edwards, "Take It From Here", was written by Muir and Norden from 1948 until 1959; the last series in 1960 used other writers. For "TIFH", as it became known, they created "The Glums", a deliberately awful family, which was the show's most popular segment. For "TIFH", Muir and Norden wrote the phrase, "Infamy, infamy, they've all got it in for me", later used by Kenneth Williams in "Carry on Cleo". In his autobiography "A Kentish Lad" Muir expressed disappointment that he and Norden were never credited for it.