Wimberley then served as a General Staff Officer Grade 2 (GSO2) at the War Office for four years, during which time he received a promotion on 3 January 1934 to major, and brevet lieutenant-colonel on 1 January 1936, before returning to an active command when he was promoted to the rank of lieutenant-colonel on 19 December 1938 and succeeded Lieutenant-Colonel James Gammell as Commanding Officer (CO) of the 1st Battalion, Cameron Highlanders, then stationed in England, which he commanded until the outbreak of war nine months later.