 From 1904, he was a Freemason.Grossmith co-wrote the successful "Havana" (1908), while he moved to another Edwardes theatre to play Count Lothar in "A Waltz Dream".Grossmith was given writing credits for some of the Gaiety pieces, usually adaptations from French comedies (like "The Spring Chicken") or collaborations with other writers (such as "The Girls of Gottenberg"), but he wrote the libretto to "Peggy" on his own.