MI5 chief says Chinese spies pose threat to UK national security ‘every day’

Director General of MI5 Sir Ken McCallum delivers the annual Director General’s Speech at Thames House, the headquarters of the UK’s Security Service in London (Jonathan Brady/PA) - (PA Wire)

The Security Service carried out an operation against a threat from China within the last week, the head of MI5 said as he admitted being “frustrated” by the collapse of the Westminster spying trial.

Sir Ken McCallum said “Chinese state actors” present a national security threat to the UK “every day”.