[4] Near to this was the smaller Keith's Chapel, the location before the Marriage Act 1753 of various clandestine marriages, including the marriages of the Duke of Chandos and Mrs Anne Jeffrey in 1744, Lord Strange and Mrs Lucy Smith in 1746, Lord Kensington and Rachel Hill in 1749, Sewellis Shirley and Margaret Rolle, widow of the second Earl of Orford in 1751, the Duke of Hamilton and Miss Gunning in 1752, and of Lord George Bentinck and Mary Davies in 1753.

[8] In May 2020, Robert Tchenguiz submitted plans to Westminster City Council to convert the building into a 65-bedroom private members' hotel.

The introduction of the Marine, &c., Broadcasting (Offences) Act 1967, which became law after midnight on 14 August 1967, forced the closure of all of these offices.

[10] Both Cass Elliot of the Mamas & the Papas and Keith Moon of the Who died in the flat within four years of each other, each aged 32.

[11] G. Heywood Hill Ltd., mentioned by Nancy Mitford in her letters, most particularly in those compiled for the book The Bookshop at 10 Curzon Street: Letters between Nancy Mitford and Heywood Hill 1952–73, remains open for trading.