https://www.theregister.co.uk/2017/09/13/cops_use_of_biometric_images_has_gone_far_beyond_using_them_for_custody_purposes/

The use of 20 million facial images by the police "has said gone far beyond using them for custody purposes", according to the Biometric Commissioners’ annual report.

Concerns have been previously raised by the commissioner over the retention of hundreds-of-thousands of innocent individuals' images. The Register was the first to report the commissioner's concerns about the legality of uploading the images onto to the Police National Database.