in 1908, blackmore rejoined the d'oyly carte opera company at the savoy theatre for the company's second london repertory season, as a member of the chorus. he played griffin david in several performances of "a welsh sunset", which was a curtain-raiser for "pinafore" that season. later that year, blackmore resumed touring with d'oyly carte, taking on the small roles of leonard meryll in "the yeomen of the guard" and francesco in "the gondoliers", as well as singing in the chorus of the other shows on tour. in 1910, he gave up playing the character of francesco but continued to play leonard until july, after which date he played only chorus roles for the next two years. during d'oyly carte's 1912–13 season, he began to play the small role of first yeoman in "yeomen". in july 1913 he added annibale in "the gondoliers" to his repertoire, stepping up to the more important role of luiz for a short period in 1914. 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. from 1921, his only principal role was annibale, but he occasionally filled in for derek oldham as tolloller in "iolanthe", before retiring from the stage in april 1922.