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What is happening?
Last week, Steve Reed, the United Kingdom’s secretary of state for housing, communities and local government, formally approved the construction of a new Chinese mega-embassy in London. The project is planned for Royal Mint Court, a historic site, close to the UK’s financial district and near sensitive underground communications infrastructure.
Once completed, the new diploma tic complex is expected to be around 10 times larger than China’s current embassy. At present, the Chinese diplomatic presence in London is spread across seven separate locations, a fragmentation Beijing has long sought to resolve. The planned complex would become the largest foreign embassy in Europe.
The decision has triggered strong criticism across the British political spectrum, as well as unease within the intelligence community. On the same day the approval was granted, the heads of MI5 and GCHQ issued a rare joint letter warning of potential national-security risks associated with the site. The intelligence chiefs described the approval as a “quasi-judicial” decision and cautioned that the location could expose sensitive information to heightened intelligence-gathering risks.
Despite these warnings, Minister of State for Security Dan Jarvis said the government was confident that UK national security interests would be protected. However, the intelligence chiefs stressed in their letter that not all risks could be fully mitigated.
What is the broader picture?
Plans for a new Chinese embassy in London have been discussed since 2018, when the site at Royal Mint Court was acquired by Chinese diplomats. An initial planning application was rejected by the local council in 2022. The proposal was resubmitted just two weeks after The Labour Party won the general election. Chinese President Xi Jinping reportedly personally asked UK Prime Minister Keir Starmer to intervene in the case.
Journalists have since obtained access to unredacted construction plans. These reveal a 208-room underground complex beneath the site. The most sensitive feature is a concealed chamber located alongside fiber-optic cables that transmit high-value data to London’s financial district. The room is reportedly designed to accommodate heat-generating equipment, potentially including advanced computing systems.
The timing of the approval has also raised questions. It was announced just one week before Starmer’s anticipated visit to China — the first visit to China by a UK prime minister since 2018 — leading to suggestions that the decision may have been intended to gain favor with Beijing ahead of the trip.
The move comes as the UK is itself seeking permission to rebuild its embassy in Beijing. This request has so far been blocked by Chinese authorities, and critics have argued that the London approval represents a concession to Chinese pressure. In a statement issued last year, a spokesperson for China’s foreign ministry warned that, if the project were refused, “the British side shall bear all consequences.”
Why does it matter?
Embassies have long functioned not only as hubs for intelligence activity. Given concerns over Russian and Chinese influence operations that led to the commission of an independent review in December 2025 (with a report due in March 2026), there are fears that London risks becoming a modern espionage crossroads, like Vienna during the Cold War. Calls for action, not just in the UK but across Europe, gained additional urgency last week after Czech authorities announced the arrest of a Chinese citizen on suspicion of spying.
Besides the potential for espionage, critics argue that the planned embassy could facilitate what human rights groups call transnational repression. This includes monitoring, intimidation or coercion of the Chinese diaspora. China has previously been forced to shut down several extraterritorial police stations in the UK.
With its large Chinese diaspora, which included many exiled Hong Kong pro-democracy activists, Britain is seen as a particularly sensitive environment. Members of the diasporic community have voiced unease over construction plans that include underground rooms with no clearly defined purpose, warning that such spaces could be used as detention facilities.
London has previously emerged as a permissive environment for hostile foreign influence. For years, the openness of Britain’s financial system enabled Russian oligarchs and organized crime networks to launder money on a vast scale, earning the capital the nickname Londongrad. As relations with Moscow deteriorated, those networks became a major national security liability. With the greenlight of this new embassy, a comparable long-term dilemma could be in the offing.