I see one of the winners of Listener 4632 Heads and Tails is D F Manley of Oxford. Must be none other than Don Manley, prolific setter:
Don Manley (born 2 June 1945), a physics graduate from Bristol, now lives in Oxford where he worked as an editor for OUP.
Don has been setting crosswords since 1963. He has supplied puzzles for Radio Times, The Spectator, The Independent, The Times, The Daily Telegraph, The Guardian, and the Financial Times among others. He is one of the three current setters of the Mephisto crossword in the Sunday Times, and is crossword editor of Church Times.
His various pseudonyms - Duck, Pasquale, Quixote, Bradman, Giovanni, Izetti - are all punningly connected with the name Don or Donald.
He has also written what is widely regarded as the standard book on setting and solving crosswords: Chambers Crossword Manual.