A successful musical production of The Rivals with songs by Herbert Hughes and lyrics by John Robert Monsell was staged by Vladimir Rosing at London's Novelty Theatre in September 1935. The Novelty Theatre had a few other names but was demolished in 1941 as Kingsway Theatre. Queen Mary attended one of the performances.
"Maverick" adaptation (1958)
The play was rewritten as a 1958 episode of the television series Maverick, starring James Garner and Roger Moore, and was the only episode of the series in which Garner and Moore appeared together (Moore did not play "Beau Maverick," the cousin of Bret, until after Garner had left the series). Patricia "Pat" Crowley portrays the leading lady. The episode was called "The Rivals" and the original playwright was given due credit.
The BBC produced a version which was broadcast in 1970 as part of their Play of the Month series, starring Jeremy Brett as Captain Jack Absolute.