Millions of people face having their faces tracked and scanned under government-backed plans to roll out live facial recognition cameras to the West End.

The UK's biggest police force today revealed its 'ambitious' scheme to introduce the technology to one of the capital's busiest and most popular destinations - building on the 'success' of a six-month pilot in Croydon.

Commissioner Mark Rowley described the cameras as 'revolutionary' - saying they would target wanted criminals and registered sex offenders.

The Metropolitan Police could not provide an estimate on how many people's faces it expects to register, but it is understood that millions were scanned in a previous year of trials.

The technology - which incorporates subtler fixed cameras mounted on lampposts rather than the high-profile vans used in previous trials - has raised concern amongst civil liberties groups who argue the force's 'rosy picture' of the approach masks a 'dangerous reality'.

Jack Coulson, Head of Advocacy at Big Brother Watch, told the Daily Mail that while tackling crime hotspots is in 'everyone's interests' the use of fixed, static cameras is an 'alarming escalation of an intrusive technology'.

He said: 'Forcing people to enter a digital police line-up in the capital's busiest and most popular destinations is an affront to the idea that you should not have to identify yourself to the police if you have done nothing wrong. To see a play, you must now pay with your privacy.

'Legislation to regulate the police's use of facial recognition is expected in the Autumn. Yet the police are rushing ahead with AI monitoring of the public under their own rules.

'We are calling on the Met to stop this experiment until, at least, Parliament has spoken. Policing by consent is a cultural inheritance we must protect. Permanent biometric surveillance of the public square is incompatible with that ideal.'

Mr Coulson went on to give the example of one Asian man being mistaken for another.

He said: 'Facial recognition surveillance makes mistakes. Just this February, Alvi Choudhury was arrested, held for ten hours, and only released at 2am for a crime committed in a city he'd never visited.

'It is predictable, given the technology's racial bias, that Mr Choudhury was confused for another Asian man.'

The Metropolitan Police has made more than 2,000 arrests using LFR (live facial recognition) cameras since the start of 2024.

Sir Mark Rowley has insisted the technology is supporting police officers rather than replacing them.

He said the six-month pilot in Croydon had delivered over 170 arrests, a reduction in crime and 'significant fall in violence against women and girls' - with only one false alert among hundreds of thousands of people.

But Akiko Hart, Director of Liberty, said the West End expansion represents a 'major escalation in use'.

Ms Hart said: 'Robust safeguards, oversight, and transparency on the use of facial recognition cameras should have been in place before they were ever introduced to our city centres and high streets. 

'To reach the level of fixed cameras across the capital before we even have a law in place is deeply concerning.

'The Government has committed to a dedicated legal framework for facial recognition technology. 

'It is vital that this includes clear and consistent rules around how the police use facial recognition to ensure the rights of the public are protected at all times. Until this in place the Metropolitan Police should pause their use of the technology, not expand it.'

In April, Sir Mark warned the technology was necessary so police could keep tabs on criminals let loose on the streets under Labour's social justice reforms.

The Met won a landmark High Court challenge the same month about the use of the technology, with judges rejecting claims that police broke human rights and privacy laws by scanning faces in public.

Sir Mark said there was a 'mandate' for expansion in the use of the 'fabulous' technology - which will be essential under Labour’s plans to jail fewer offenders by ditching shorter prison sentences and releasing inmates earlier.

He said: 'It helps us as we’re going to have more offenders in the community, that’s the government policy.

'Done well, if people are in the community and it’s well supervised and it’s rehabilitative, that could reduce crime.

'If it’s not done well, then obviously the risks are there with that and time will tell.

'But we’ve seen how facial recognition can help us in the supervision of offenders.'

During the Croydon pilot, the Met said more than 470,000 people walked past the camera - with one false alert generated.

The cameras work by taking digital images of passing pedestrians, feeding them into a computer using biometric software to measure facial features.

The image is compared with a watchlist and if a match is detected, an alert is sent to officers to review and consider making an arrest.

If a member of the public is not wanted by police, their biometrics are immediately deleted.