Plans for China's vast new diplomatic compound in London have ignited significant national security concerns, with reports indicating a secret underground chamber could be used for espionage against the UK. The proposed 'super embassy' on the historic Royal Mint site is at the centre of a growing row over its proximity to vital communications infrastructure.
Secret Chambers and 'Spy Dungeons'
According to unredacted plans seen by The Telegraph, a hidden triangular room measuring up to 40 metres across and 2-3 metres deep is proposed for the north-west corner of the building. This chamber would sit just metres away from a critical cable network connecting London's top financial sectors in the City and Canary Wharf. The design includes at least two air extraction systems, suggesting it could house heat-generating equipment like high-tech computers.
This room is reportedly part of a network of 208 secret rooms, most hidden from public planning documents, beneath the embassy. Last year, The Mail on Sunday revealed that planning documents referenced 'spy dungeons' – two suites of anonymous basement rooms and a tunnel, with their purpose redacted for security reasons. Diplomatic sources have also suggested the site could provide on-site accommodation for over 200 intelligence officers.
Proximity to Critical Infrastructure
The security alarm stems from the building's location adjacent to sensitive underground communications cables along Mansell Street. These cables, owned by firms including BT, Colt Technologies, and Verizon, carry data to and from major financial institutions and are close to three major data centres, including the London Stock Exchange.
Documents indicate the outer wall of the secret chamber, lying directly next to these cables, would be demolished and rebuilt. Security expert Professor Alan Woodward described this as a 'red flag', stating that having the cables so close would present an 'enormous temptation' for a foreign state. Fears persist that China could tap into these lines to eavesdrop on economically sensitive information.
Political Pressure and Planning Delays
The decision on whether to approve the embassy, purchased by China for £255 million in 2018, has been fraught with delay. A ruling was expected on 10 December but was postponed to allow Housing Secretary Steve Reed more time to examine the proposal, with Downing Street citing 'particular security implications'.
Beijing criticised the delay as 'completely unjustified'. Reports suggest Downing Street has proposed that Prime Minister Sir Keir Starmer approve the plans before his anticipated first official visit to China, expected between 29 and 31 January, in a bid to smooth diplomatic relations.
China has dismissed claims the embassy could be an espionage hub. BT stated it has 'robust security measures in place' and works with the government to protect its assets. The Ministry of Housing, Communities and Local Government declined to comment while the application is under assessment.
