Muggeridge's father, Henry (known as H. T. Muggeridge) served as a prominent Labour Party councillor in the local government of Croydon, South London, as a founder-member of the Fabian Society,[REF] and as a Labour Member of Parliament for Romford (1929-1931, during Ramsay MacDonald's second Labour government).
The middle of five brothers, Muggeridge was born in Sanderstead, Surrey.