A former MI6 chief has warned that China could potentially bring Britain to a halt by cutting off access to critical components of the country’s power grid. Sir Richard Dearlove told members of Parliament that Beijing’s increasing control over essential materials and technology creates significant strategic leverage, which could be exploited in times of crisis.

Dearlove explained that Britain has become increasingly dependent on Chinese steel and technology needed to maintain and build infrastructure such as the national power grid. He stated that this peacetime dependency effectively grants China "weapons of mass disruption," capable of causing a complete shutdown of the country’s operations. Although British engineers retain the ability to design and assemble the equipment necessary for the grid, the raw materials required are largely sourced from China, which the director-general of MI5 has identified as the foremost national security threat.

The assessment follows diplomatic developments, including a recent conversation between Prime Minister Andy Burnham and Chinese President Xi Jinping, their first discussion since Burnham took office. The warning has also resonated with politicians concerned about national resilience. Labour MP Graeme Downie, chairing the Coalition on Secure Technology, called on the government to acknowledge the threat publicly and to provide guidance to citizens on how to prepare for potential power outages.

In response, a government spokesman said efforts are underway to strengthen domestic supply chains for essential grid components, aiming to reduce reliance on foreign sources. However, specific measures or timelines were not detailed.

The situation underscores growing concerns over the vulnerabilities embedded in global supply networks, particularly in sectors critical to national security and infrastructure. The reliance on foreign materials and technology raises complex challenges for maintaining operational independence in times of geopolitical tension.