"Facial recognition in China is "absolutely correct" and "spot on", the head of the Metropolitan Police Federation has said, calling for it to be deployed in London "on a 24-hour basis".

Mr Marsh gave the example of the 2017 London Bridge attack, when police lost track of the terrorists in the run-up to the killings.

He said: "Facial recognition, if it was pointed in certain areas in London on a 24-hour basis, could pick these individuals up… if we could have stopped that I'm all for this.".."

https://news.sky.com/story/facial-recognition-in-china-spot-on-say-metropolitan-police-federation-11757577