In 1979, Duke was a founding member of the Gay Humanist Group, (now Gay and Lesbian Humanist Association) after Mary Whitehouse began a private prosecution for blasphemous libel against Gay News (see Whitehouse v Lemon.
The first meeting of the Festival of Light was organised by Mary Whitehouse at Methodist Central Hall.
The film was to have been made in Britain, but it faced intense opposition from Christian morality campaigner Mary Whitehouse, pressure groups, as well as from the Queen, then Prime Minister James Callaghan, and the Archbishop of Canterbury, Donald Coggan.
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Unlike the criticism of violence levelled against the series by Mary Whitehouse during the Philip Hinchcliffe era, disapproval this time came from members of the general public and some Doctor Who fans, as well as Whitehouse.
He has written several radio plays for the network, including St Graham and St Evelyn (2003) on the friendship between the Catholic novelists Graham Greene and Evelyn Waugh and The Third Soldier Holds His Thighs (2005) on Mary Whitehouse's unsuccessful litigation against the National Theatre production of Howard Brenton's play The Romans in Britain.