During the Second World War Grenfell wrote for and appeared in three more West End revues: Diversion and Diversion No. 2 at Wyndham's Theatre in 1940 and 1941, and Light and Shade at the Ambassadors in 1942.Herbert, pp. 863–864 In early 1942 she met the composer Richard Addinsell. Together they wrote many successful songs including "I'm Going to See You Today" and "Turn Back the Clock", which, in the words of the biographer Janie Hampton, "aptly caught the public mood".
During the Second World War Grenfell wrote for and appeared in three more West End revues: Diversion and Diversion No. 2 at Wyndham's Theatre in 1940 and 1941 and Light and Shade at the Ambassadors in 1942.Herbert, pp. 863–864 In early 1942 she met the composer Richard Addinsell. Together they wrote many success,ful songs including "I'm Going to See You Today" and "Turn Back the Clock", which, in the words of the biographer Janie Hampton, "aptly caught the public mood".