Derby Day is a 1932 three-act light opera, with music composed by Alfred Reynolds to a libretto by A. P. Herbert.
Herbert wrote his text between March and May 1931, whilst on a trip to Australia, during the first run of his successful Tantivy Towers.
[5] Derby Day was shown in a 40-minute broadcast on BBC television in July 1937, with a cast including George Baker as Mr.
Bitter and Frederick Ranalow (who had appeared in the Playfair/Austin production of The Beggar's Opera) as Waters.
[5] It was broadcast again in June 1938 with Muriel George and Esmond Knight, and Baker and Ranalow swapping roles.