It was hailed by UK Chancellor George Osborne as a "new dawn" - but serious questions remain about the security implications of Britain's nuclear energy deal with China.
The UK government has refused to say whether China's planned investment in the British nuclear industry was approved by the National Security Council - the body that assess the risks from foreign investment in critical national infrastructure projects.
Chancellor George Osborne announced during his trip to China in October that Chinese state owned companies CGN and CNNC would be allowed to take a 40% stake in the company planning to build the Hinkley C nuclear power station in Somerset.