In the 1970s he appeared with the Royal National Theatre in Macbeth, Hamlet, The Tempest and Long Day's Journey into Night, alongside Laurence Olivier in the last.
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Quilley played in the first London production of the musical The Boys from Syracuse (Antipholus of Ephesus) in 1963 at the Theatre Royal, Drury Lane, alongside Bob Monkhouse and Ronnie Corbett.
Saint-Denis | Denis Diderot | Saint-Ouen, Seine-Saint-Denis | Denis Leary | Denis | Seine-Saint-Denis | Claire Denis | Montreuil, Seine-Saint-Denis | Denis Halliday | Denis Healey | Charles Denis Bourbaki | Ruth St. Denis | Maurice Denis | Denis Thatcher | Denis Sassou Nguesso | Denis McLoughlin | Siméon Denis Poisson | Saint-Denis, Réunion | Gare d'Estrées-Saint-Denis | Denis Smith | Denis Piel | Denis Lawson | Denis Johnson | Denis Boyles | Basilica of St Denis | Villepinte, Seine-Saint-Denis | Saint Denis Street | Saint-Denis, Quebec | Saint-Denis-lès-Martel | Neil Denis |
A concert version of the show was performed on BBC Radio in 1994 (with a cast that included: Denis Quilley, Kim Criswell, Joss Ackland, Henry Goodman, and Louise Gold), and Opera North staged the show, along with a revival of Of Thee I Sing, during its 2008-9 season.