British Transport Police live facial recognition trial in London stations produced one false match and no arrests
A six-month British Transport Police trial of live facial recognition in London railway stations scanned more than half a million faces between February and July. A freedom of information request shows the 18 deployments cost £320,786 and produced only one watchlist alert, which was a false positive, and no arrests. BTP has since extended the trial by four months and expanded it to London Underground stations. A Labour MP called for the rollout of live facial recognition to be suspended until stronger safeguards are in place, and a parliamentary human rights committee called it a particularly clear example of risk.
What the AI did
The live facial recognition system scanned more than half a million faces of people passing through London railway stations and compared them against a police watchlist of suspects. Its only alert during the trial was an incorrect identification, known as a false positive, and it led to no arrests.
First reported September 29, 2026 · Added to the register September 30, 2026 · 1 source
- Deployer
- British Transport Police
- Country
- United Kingdom
- When it happened
- February 2026 to July 2026
- First reported
- September 29, 2026
What this means for you
Could this affect you?
Rail passengers in London stations had their faces scanned by live facial recognition, and one person was wrongly matched against a police watchlist.
What to check
- Document why any facial recognition use is proportionate and necessary.
- Measure and record accuracy, including false-positive rates.
- Control how watchlists are built.
- Prepare for regulator scrutiny of how biometric data is processed.
Areas of your AI programme this touches
Timeline
- February 2026Started
- July 2026Ended
- September 29, 2026First reported
Every fact and its source (6)
- Nature of the only alertFalse positive“which turned out to be an incorrect identification, also known as a false positive”[1]
- Faces scannedMore than half a million, February to July“More than half a million faces were scanned between February and July this year”[1]
- Trial cost£320,786 across 18 deployments“equipment hire and police staffing for the 18 deployments across the trial cost £320,786”[1]
- ResponseTrial extended four months and expanded to London Underground“Last month BTP announced it was extending the trial for a further four months and expanding the deployments to include London Underground stations.”[1]
- Alerts since extensionThree confirmed alerts, people found compliant with court orders“three positive confirmed alerts of people who were subsequently confirmed to be complying with sexual harm prevention orders”[1]
- Trial outcomeOne false match, no arrests“led to one false match against a watchlist of suspects and no arrests”[1]
Sources
- Trial of live facial recognition in London stations ends with a false positive and no arrestsaol.co.uk · September 29, 2026
How this record is classified. Severity M (2/5): harm to individuals, or a policy breach with limited reach. OECD level: hazard, an event that could plausibly have led to harm. Evidence: Confirmed, meaning a company, official or court statement.
The facts in At a glance and in Every fact and its source are quoted from the sources listed. The summary, What the AI did and What this means for you are written from those sources and reviewed by an editor before publication. Records reflect what has been disclosed, not everything that has happened.
