He was a member of the House of Lords from 1963 to 1999, where he belonged to the Conservative group.

Arthur Michael Cosmo Bertie (1886–1957) and, his first wife, Aline Rose (née Arbuthnot-Leslie) Ramsay.

[4] On 25 July 1952, he was given the acting rank of lieutenant,[5] and the promotion was made substantive on 28 June 1954 with seniority from the date of his acting rank.

[1] In 1957, Bertie married Norah Elizabeth Farquhar-Oliver, a descendant of the Farquhar baronets and great-granddaughter of John Hely-Hutchinson, 5th Earl of Donoughmore.

Together, they were the parents of two sons and a daughter:[2] He lives at Gilmilnscroft House, near Mauchline,[2] a seat of his wife's family, the Farquhars.