A six-month trial of live facial recognition (LFR) in London railway stations cost over £320,000 and nearly 100 police hours, scanning more than half a million faces. The surveillance technology led to only one alert, which proved to be a false positive and resulted in no arrests. British Transport Police (BTP) announced a four-month extension, expanding deployments to include London Underground stations.

Since the extension, three positive confirmed alerts were recorded, targeting individuals complying with sexual harm prevention orders or court conditions. Transport for London supported the extension, stating LFR would "target and identify people on police watchlists" to "specifically tackle violence against women and girls." Fraser Sampson, former biometrics commissioner, criticized the proportionality of the deployment, noting success in shops differs from public transport. He emphasized that the technology only affects those on watchlists and requires appropriate, necessary use under ICO oversight.

More than half of English and Welsh police forces have now deployed LFR. The Metropolitan Police and London mayor Sadiq Khan announced fixed LFR cameras in the West End and newly pedestrianised Oxford Street. A joint human rights committee report identified live facial recognition as a "particularly clear example of risk," with Labour MP Bell Ribeiro-Addy calling for a suspension until stronger legal safeguards exist.