[1] The original West End cast included Ernest Milton, Edmund Breon, Eric Maturin, Malcolm Keen, Ian Hunter, Cathleen Nesbitt, Beatrix Thomson, and Meggie Albanesi.
[2] Charles Winsor: Owner of Meldon Court, near Newmarket Lady Adela: His Wife Ferdinand de Levis: A young Jew Treisure: Winsor's butler General Canynge: A racing oracle Margaret Orme: A society girl Ronald Dancy: Army Captain Mabel: His wife Inspector Dede: Of the County Constabulary Robert: Winsor's footman A Constable: Attendant on Dede Augustus Borring: A clubman Lord St Erth: A Peer of the Realm A Footman: Of the Club Major Colford: A brother officer of Dancy Edward Graviter: A solicitor, junior partner of Twisden & Graviter's A Young Clerk: Of Twisden & Graviter's Gilman: A grocer Jacob Twisden: Senior partner of Twisden & Graviter's Ricardos: An Italian wine merchant The play is an exposé of antisemitism in English upper-class society in the 1920s.
In 1933 the play was made into a film, Loyalties, adapted by W P Lipscomb, directed by Basil Dean and Thorold Dickinson and starring Basil Rathbone as Ferdinand de Levis, Miles Mander as Captain Ronald Dancy, Algernon West as Charles Winsor, Cecily Byrne as Lady Adela Winsor, Alan Napier as General Canynge, Heather Thatcher as Margaret Orme, Joan Wyndham as Mabel Dancy, Athole Stewart as Lord St. Erth, Philip Strange as Major Colford, Robert Mawdesley as Graviter, Lawrence Hanray as Jacob Twisden, Ben Field as Gilman, and Anthony Holles as Ricardos.
The play was broadcast on BBC Radio's Saturday Night Theatre in 1967, adapted for radio by Peggy Wells and produced by Betty Davis, with Keith Michell as Captain Ronald Dancy, John Justin as Ferdinand de Levis, Rolf Lefebvre as Charles Winsor, Diana Olsson as Lady Adela Winsor, Wilfred Babbage as Treisure, Robert Sansom as General Canynge, Margaret Ward as Margaret Orme, Hilda Schroder as Mabel Dancy, Stephen Thorne as Inspector Dede, Frederick Treves as Augustus Borring, Geoffrey Wincott as Lord St Erth, Alexander John as Major Colford, Frank Henderson as Graviter, Howieson Culff as Jacob Twisden, Ronald Herdman as Gilman, Harold Kasket as Ricardos, and Gordon Gardner as Robert.
In 1976, BBC Television broadcast a version as part of their Play of the Month series, directed by Rudolph Cartier and produced by Cedric Messina.
It starred Edward Fox as Captain Ronald Dancy, Charles Kay as Ferdinand de Levis, John Carson as Charles Winsor, Dinah Sheridan as Lady Adela Winsor, Erik Chitty as Treisure, Robert Flemyng as General Canynge, Polly Adams as Margaret Orme, Catherine Schell as Mabel Dancy, Roger Hammond as Inspector Dede, Jeremy Clyde as Augustus Borring, Peter Dyneley as Lord St. Erth, Tom Criddle as Major Colford, Geoffrey Palmer as Graviter, David Markham as Jacob Twisden, Frank Middlemass as Gilman, and Steve Plytas as Ricardos.
[3] He reported that he saw the play with a packed house "who seemed, like me, to relish Galsworthy's portrait of the poisonous worm inside the woodwork of English society."