Departing from the station's heavily commercial "Fab 40" playlist, Peel began broadcasting a mixture of folk, blues, psychedelic and progressive rock tracks that he happened to like, announcing them in a shy, laconic drawl which contrasted sharply with the fast-talking, upbeat presentation of most pirate radio disc-jockeys. The first the Radio London management knew of his programme was when it began to gather glowing reviews in the music press - and when the station's London office received an appreciative letter from The Beatles' manager Brian Epstein.