Henry Flitcroft in the context of "Westminster School"

The Royal Institute of International Affairs, also known as Chatham House, is a British think tank based in London, England. Its stated mission is "to help governments and societies build a sustainably secure, prosperous, and just world." Conversely, it has been praised for providing a safe space for speakers and encouraging openness.

The Royal Institute of International Affairs has its headquarters in central London at 10 St James's Square, which is known as Chatham House. It is a Grade I listed 18th-century building that was designed in part by Henry Flitcroft and was occupied by three British prime ministers, including William Pitt, 1st Earl of Chatham, whose name became associated with the house. Canadian philanthropists Lieutenant-Colonel Reuben Wells Leonard and Kate Rowlands Leonard purchased the property in 1923 and then donated the building to the fledgling institute as its headquarters. As a result, the Chatham House name is used as a metonym for the institute as a whole.

Savile Row (pronounced /ˌsævɪl ˈroʊ/) is a street in Mayfair, central London. Known principally for its traditional bespoke tailoring for men, the street has had a varied history that has included accommodating the headquarters of the Royal Geographical Society at 1 Savile Row, where significant British explorations to Africa and the South Pole were planned; and more recently, the Apple office of the Beatles at 3 Savile Row, where the band's final live performance was held on the roof of the building.

Originally named Savile Street, it was built between 1731 and 1735 as part of the development of the Burlington Estate. It was designed under the influence of Burlington's interpretation of Palladian architecture, known as "Burlingtonian". Henry Flitcroft, under the supervision of Daniel Garrett, appears to have been the main architect – though 1 and 22–23 Savile Row were designed by William Kent. Initially, the street was occupied mainly by military officers and their wives; later William Pitt the Younger and Irish-born playwright and MP Richard Brinsley Sheridan were residents.