London Mayor Sadiq Khan blocked a £50 million deal between Palantir and the Metropolitan Police. The Mayor's Office for Policing and Crime (Mopac) cited a clear and serious breach of procurement rules.

Mopac withheld approval because Scotland Yard failed to engage with other potential suppliers. Officials stated the proposed contract did not demonstrate value for money.

This decision marks Palantir's largest contract setback within British policing. The company faces increasing scrutiny over its roles with the NHS and the Ministry of Defence.

A mayoral spokesperson stated that public funds must go to companies sharing the city's values.