[6] His PhD thesis was entitled "The Politics of Foreign Policy: Lord Derby and the Eastern Crisis, 1875-8".

[7] In 2016 he sold a newly identified portrait by Joan Carlile, the first professional British female artist, to the Tate gallery.

[9] In 2017, he discovered the "lost portrait" of George Villiers, 1st Duke of Buckingham at Pollok House, Glasgow, Scotland.

[14] During the COVID-19 pandemic of 2020-21, he and his wife Ishbel investigated the route of the Roman road known as Dere Street through Lauderdale in the Scottish Borders.

[17] In 2013 he discovered the lost portrait of Charles Edward Stuart by Scottish artist Allan Ramsay at Gosford House, the home of the Earl of Wemyss near Edinburgh.

[19] Grosvenor is a second cousin nine times removed to both Jacobite Princes, since he is a descendant of King Charles II and Louise de Kérouaille.