Re:Chinese police use facial recognition tech to arrest susp...
by firmgently on Friday April 13, 2018 @11:45AM
(#16831096)
Another one which got a bit of press was Download (music festival) in 2015: "A police force has defended scanning the faces of 90,000 festival-goers this weekend and checking them against a list of wanted criminals across Europe."
http://www.bbc.co.uk/news/uk-england-leicestershire-33132199
https://www.theguardian.com/uk-news/2017/aug/05/met-police-f...
I would suspect if there has already been one public announcement then it will actually have been used covertly for quite a while.