Buried in the WSJ's piece. "Back in 2021, the British government quietly expelled three suspected Chinese spies who posed as journalists, according to a U.K. official. The three worked for China’s Ministry of State Security" https://www.wsj.com/world/china/u-k-arrests-parliamentary-researcher-in-china-spy-probe-d098d169
Original tweet: https://twitter.com/shashj/status/1701238081716641911