 In 1920 the War Office appointed Lord Gretton as Lieutenant-colonel Reserve Officer until demobilised in 1922.In 1895 he was elected to the House of Commons as Member of Parliament (MP) for Derbyshire South, a seat he held until 1906.He then represented Rutland from 1907 to 1918 and Burton from 1918 to 1943, when he was appointed an Officer of the Order of St John (OStJ).