From 1925 onwards he served as a magistrate and county councillor in Hampshire, and after retirement increased his involvement with local administration.

[1] His father, Arthur Frederick Jeffreys, was a rural landowner, with an estate at Burkham, near Alton, Hampshire; he was later elected to Parliament, as a Conservative, and held the seat for almost thirty years.

She was the widow of Lionel Sackville, Viscount Cantelupe, the eldest son of the Earl De La Warr, an officer in the Queen's Own Royal West Kent Regiment, who had died a few months after their marriage in 1890.

[1][7] Following the end of the war two months later, he returned with most of the men of the guards regiments on board the SS Lake Michigan, which arrived in Southampton in October 1902.

[3] On the outbreak of the First World War in August 1914, Jeffreys rejoined his regiment, and went overseas with the British Expeditionary Force (BEF).

[3][11] He remained with the battalion until January 1916, when he was promoted to command the 58th Infantry Brigade in the 19th (Western) Division, with the temporary rank of brigadier general.

[17] Promoted to substantive major general in June 1919,[18] he was then transferred to command the Light Division in the British Army of the Rhine, the occupation forces in Germany, and in 1920 returned to England as Major-General commanding the Brigade of Guards and GOC London District, taking over from Major General Sir Geoffrey Feilding in February 1920.

He also worked as a magistrate, becoming Chair of the Basingstoke County Bench in 1925, and continuing to sit until 1952, with the exception of a four-year gap during his Indian posting.

[1] In a 1941 wartime by-election, he was elected as a Conservative to the House of Commons for Petersfield in Hampshire; he held the seat until his retirement in 1951.