[8] In 1907, at the age of twelve, Andrews appeared in Horace Annesley's comedy Her Son as "Min, the eight-year-old child of Crystal and Gasgoyne,"[9] a role for which he received significant acclaim.

Andrews' "finished and sympathetic performance" was described as "the success of [Her Son's] première,"[10] "a genuine and surprising triumph"[9] that caused "quite a sensation.

[12] He appeared as Simon in the original production of Noël Coward's Hay Fever at London's Ambassadors Theatre, in 1925.

[13] Andrews starred in a number of Novello's theater productions, beginning with the play Fresh Fields in 1932.

[6] Amongst his many character parts was the Prime Minister in Ivor Novello's musical play King's Rhapsody at the Theatre Royal, Drury Lane.