Piccadilly Circus lights facial detection system 'incredibly intrusive'

Facial detection technology in the new Piccadilly Circus lights is "incredibly intrusive", according to privacy campaigners.The revamped screen in central London will be turned on later in October in a space where 100 million people pass each month.Privacy campaigners say signs should be put up in Piccadilly Circus to inform the public they are being monitored.