[2] He was drawn to a theatrical career, and in 1908 he made his first appearance on the stage at the Spa Theatre, Bridlington in the musical comedy The Girl from Kays.

In the English provinces he appeared in the musical comedy The Arcadians (1910), the pierrot show The March Hares (1911) and Barry Jackson and Basil Dean's Fifinella (1912).

[1][4] During the First World War, Blore enlisted and served in the South Wales Borderers and later joined the Royal Flying Corps, before being assigned to run the 38th Divisional Concert Party in France ("The Welsh Wails") 1917–1919.

[9] Blore remained in the US for the next seven years; his Broadway roles were Reggie Ervine in Mixed Doubles, Sir Calverton Shipley in Just Fancy, Sir Basil Carraway in Here's Howe, the King of Arcadia in Angela, Captain Robert Holt in Meet the Prince, Lieutenant Cooper in Roar China, Bertie Capp in Give Me Yesterday and Roddy Trotwood in Here Goes the Bride.

[8] In 1932 he toured as Cosmo Perry in The Devil Passes, before returning to Broadway to play the waiter in Cole Porter's Gay Divorce, which starred Fred Astaire and Claire Luce.

[8] As The Times put it, he joined "the select company of English actors who were persuaded to journey to California" to appear in Hollywood films, along with the likes of C. Aubrey Smith and Ronald Colman.

"[2] In 1943 Blore returned to Broadway, replacing Treacher during the run of Ziegfeld Follies,[13] and made his final stage appearance at Los Angeles in September 1945, playing Charles Mannering in the unsuccessful Tchaikovsky-based musical Song Without Words.

Taken ill in February 1959 he was moved from his Hollywood home to the Motion Picture Country Hospital, where he died of a heart attack on 1 March, aged 71.