Embassy of the United States, London

In March 1968, a crowd of some 10,000 demonstrated at Trafalgar Square against US involvement in the Vietnam War, before marching to Grosvenor Square. The Metropolitan Police had attempted to cordon off part of the square nearest to the embassy and there was violence as the crowd broke through the police line. Police horses were used to regain control. 200 demonstrators were arrested and 50 people needed hospital treatment including 25 police officers, one of them with a serious spinal injury.[14] In October of the same year, during a demonstration organised by the Vietnam Solidarity Campaign, a splinter group of 6,000 demonstrators returned to the square. A thousand police officers formed a cordon that the protesters failed to breach and remained relatively peaceful until the crowd began to disperse when there was disorder in the neighbouring streets.[15]

Thousands of protesters marched on the embassy as part of a worldwide anti-racism demonstration following the murder of George Floyd in 2020.[16][17][18]

Security at the Grosvenor Square embassy was tightened in the 1980s and 1990s following successive terrorist attacks on U.S. embassies and consulates worldwide. It was further increased after the September 11 attacks in 2001. A massive security operation at the embassy saw one side of Grosvenor Square closed to public access by car, and armed roadblocks were stationed outside the building. On 29 August 2002, Kerim Chatty, a Swedish citizen of Tunisian descent, was arrested at Stockholm-Västerås Airport trying to board a Ryanair Flight 685 destined for London Stansted Airport with a loaded gun in his luggage. Anonymous intelligence sources cited in the media claimed that the man was planning to hijack the aircraft and crash it into the United States embassy in London, using the rooftop eagle to identify it from the air. Sweden's Security Service, Säpo, denied the claims and called the reports "false information".[19] The man was subsequently cleared of all terrorism-related charges.[20]

The security threat against the embassy prompted the U.S. government to consider moving the embassy. Several British media outlets reported that the U.S. government had wished to use Kensington Palace as their embassy, which allegedly had been vetoed by Queen Elizabeth II, as several members of the British Royal Family have their residences there. The embassy "strenuously denied" the reports, and a spokesman for Buckingham Palace reported that no formal request had been made.[21] Another possible option was Chelsea Barracks, for which the U.S. Embassy made an unsuccessful bid in February 2007.[22]

American Embassy nearing completion of construction, as seen from Pimlico, across the River Thames

On 8 October 2008, the embassy announced a conditional agreement with the real estate developer Ballymore Group to purchase property for a new embassy site on the South Bank of the River Thames in the Nine Elms area of the London Borough of Wandsworth.[23] The site lies within the Vauxhall/Nine Elms/Battersea Opportunity Area as set out in the London Plan. The proposed plan would only go forward if approved by the United States Congress and by the local planning authority.[24] The Northern line extension to Battersea includes new stations at Battersea and Nine Elms, combined with major local development. The United States Department of State announced in January 2009 that it was choosing among nine architectural firms, all "modern" and "upmarket", to replace the ageing embassy headquarters.[25] In March 2009, the U.S. Department of State's Bureau of Overseas Buildings Operations announced that four architectural firms had been selected for the final phase of the design competition.[25] By law, the architect for a U.S. embassy must be an American firm with "numerous security clearances".[25]

View of the US Embassy building from Ponton Road with the Embassy Gardens Sky Pool in the background

In November 2009, the U.S. government conditionally agreed to sell the lease of the Grosvenor Square Chancery Building to Qatari real-estate investment firm Qatari Diar, which in 2007 purchased Chelsea Barracks.[26] Though the price was undisclosed, the lease's worth was estimated at £500 million in July 2000.[27] The development value of the property was reduced when the building was given Grade II listed status, requiring developers to maintain its current design. The building is now one of Mayfair's 238 listed buildings and monuments.[28][29] In 2016, plans were approved for the conversion of the building into a hotel.[30]

View of the US embassy building from Nine Elms Lane

On 23 February 2010, the U.S. government announced that a team led by the firm of KieranTimberlake had won the competition to design the new embassy building and surrounding green spaces.[31] The winning design resembles a crystalline cube, with a semi-circular pond on one side (called a "moat" by The Times)[32] and surrounded by extensive public green spaces[33] and the Embassy Gardens housing development.

Ground was broken on 13 November 2013, and the building opened to the public on 13 December 2017.[34][35] US President Donald Trump had been expected to visit in February 2018 to undertake the official opening of the new embassy but, in January 2018, announced he would not make the trip. Trump publicly criticized the cost of the new embassy and its location, as well as the apparent price received for the sale of the lease of the building in Grosvenor Square, blaming the administration of his predecessor, Barack Obama, for making what he referred to as a "bad deal".[36] However, the decision to move the embassy was made before the Obama administration.[37]

Jane Hartley was sworn in as the current United States Ambassador to the United Kingdom on 27 May 2022.[38] Winfield House in Regent's Park has been the official residence of the United States Ambassador to the United Kingdom since 1955.

• Deputy Chief of Mission, Matthew Palmer
• Consul General Belfast, Paul Narain
• Consul General Edinburgh, Jack Hillmeyer