The initial announcement was sent by e-mail, the closing date was 2 January, and the event was soon oversubscribed.
From the announcement in the Winter 2019 Newsletter :
For the first time the public will be given a glimpse into a secret history of amazing intelligence, world-leading innovation, and most of all brilliant people. The Top Secret – From Ciphers to Cyber Security” exhibition, which was opened by Her Majesty the Queen, marks the centenary of GCHQ, the UK’s Intelligence, Security and Cyber agency which was first acknowledged in law in 1994. Through never-before-seen objects, interactive puzzles and first-person interviews, the exhibition explores the challenges of maintaining digital security in the 21st century and the unique technologies used throughout the history of one of the UK’s intelligence agencies.
Among over 100 objects in the exhibition, that reveal fascinating stories of communications intelligence and cyber security from the last century, are cipher machines used during the Second World War, secure telephones of the type used by British Prime Ministers and an encryption key used by Her Majesty The Queen. Explore the story of Alan Turing and the team of Bletchley Park codebreakers who broke the Enigma code in 1941.
Our curator-led tour (which was initially announced by e-mail) is already fully booked, but please contact the office for last-minute cancellations.
The event took place on Thursday 16 January at 2pm, Science Museum, Exhibition Road, London SW7 2DD, and was preceded by an optional lunch.