At the Savoy Theatre Moss sang with the chorus in The Beauty Stone from May to July 1898 and appeared in the leading tenor role of the Defendant in Trial by Jury in December 1898.
He continued to play Hilarion, First Yeoman, Francesco and the Defendant until December 1906 and sang Luiz in The Gondoliers from July 1904 to January 1905.
Pinafore, Frederic in The Pirates of Penzance, the Duke of Dunstable in Patience, Tolloller in Iolanthe and Cyril in Princess Ida, in addition to Nanki-Poo, Fairfax and Marco in The Gondoliers.
[5] When Rupert D'Oyly Carte revived the touring company in October 1908 Moss appeared as principal tenor, singing the Defendant, Ralph, Frederic, Duke, Tolloller, Cyril, Nanki-Poo, Fairfax and Marco.
On the completion of the London season in March 1909, Moss rejoined the main company, but his roles were reduced to the Defendant, Frederic, Duke, Tolloller, Cyril and Fairfax.
[16] His last role in the West End was in December 1931 at the Adelphi Theatre as King Priam in Helen!,[17] Max Reinhardt's adaptation of Offenbach's La belle Hélène, in a production starring Evelyn Laye.