 He also substituted at times in leading tenor roles, including Tolloller in "Iolanthe" (1914–15), Nanki-Poo in "The Mikado" (1917), Marco in "The Gondoliers" (1917), and Alexis in "The Sorcerer" (1918).He also played the role of Cyril in "Princess Ida" in 1918.Blackmore returned to the D'Oyly Carte chorus in 1918, also playing the roles of Leonard in "Yeomen" and Annibale in "The Gondoliers" from July 1919.