Boris Johnson says it is "not true" sensitive information was withheld from him as foreign secretary.Read more
The head of MI6 has just revealed a huge secret - his first ever mission. But being a spy is very different now.
The chief of MI6 has raised questions over Chinese technology companies being involved in the UK's communications infrastructure.
Australia and New Zealand have already blocked Chinese company Huawei from supplying equipment for their 5G mobile network, and other countries have raised concerns.
MI6 boss Alex Younger said Britain needs to decide how comfortable it is "with Chinese ownership of these technologies".
In a rare speech, he also said British intelligence needs to innovate faster than its adversaries to cope with threats the country faces.
The leader of the UK's MI6 intelligence service has warned Russia "not to underestimate our determination and our capabilities".