Mi5 Official Secrets
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Burgess and Maclean Disappear
📅 Date: Friday, 11 July 2025
🕕 Time: 2:00 PM – 3:00 PM BST / 6:00 AM – 7:00 AM PDT
🧭 Location: Online | Hosted by The National Archives 🇬🇧

Guy Burgess (left) and Donald Maclean, Moscow, 1956
Step into one of the most dramatic intelligence scandals in British history. In 1951, diplomats Guy Burgess and Donald Maclean vanished without warning. Days later, they reemerged—defected to Moscow, exposed as longtime Soviet spies who had infiltrated the British government.
This compelling virtual talk will examine newly released MI5 and Foreign Office records to uncover how two of Britain’s most trusted officials passed secrets to the USSR—and how their disappearance ignited panic across Western intelligence networks.

SS Falaise, the ship on which Burgess and Maclean fled in May 1951
Learn how their actions reshaped Cold War policy, undermined Anglo-American trust, and revealed deep vulnerabilities in post-war British institutions.
Perfect for fans of real-life spy thrillers, 20th-century history, or international intrigue. Part of the National Archives’ Intelligence & Security series.
🎟️ Reserve Your Spot – Get Tickets
Free admission • Virtual event • Registration required
Hosted by The National Archives, United Kingdom
Discover an ever-changing world of subversion and espionage over MI5’s 115-year old history in a ground-breaking exhibition that will take you behind the scenes of one of Britain’s most iconic institutions.
The National Archives is the official archive and publisher for the UK government and for England and Wales, and is the guardian of some of the nation’s most iconic national documents, dating back over 1,000 years.
The National Archives is a non-ministerial department.
Wednesday 28 May, 19:30 (GMT)