From the Telegraph of 3 Jan 2022: GRAHAM Robin Angus died peacefully on 27th December 2021, aged 95, at Campsea Ashe, Suffolk. Funeral at St Peter’s Church, Blaxhall on 19th January 2022 at 12 noon. Enquiries to E B Button & Sons, Woodbridge... Donations in memory of Robin are for SongBird Survival Trust.
He was s of Capt Lord Alastair Mungo GRAHAM 1886-1976 (s of 5th Duke of MONTROSE 1852-1925 etc etc) and his 1st w Lady Meriel Olivia BATHURST 1894-1936 d of 7th Earl BATHURST 1864-1943 and Hon Lilias Margaret Frances BORTHWICK 1871-1945 (d of 1st & only Baron GLENESK 1830-1908 and gt gd of 1st Earl of CLARENDON 1709-86 etc etc). He never married.
He was the final male listed in Debrett's MONTROSE article. That "distinction" now falls to Alastair David GRAHAM b 1959, m with two daus.