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Freedom of information request finds six-month trial cost £320,000, used almost 100 police hours and led to just one – incorrect – alert
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Capital of England and the United Kingdom
London is the capital and largest city of England and the United Kingdom, with a population of 9.14 million people in 2025. Its wider metropolitan area is the largest in Western Europe, with a population of 15.4 million. London stands on the River Thames in southeast England, at the head of a 50-mile (80 km) tidal estuary down to the North Sea, and has been a major settlement for nearly 2,000 years. Its ancient core and financial centre, the City of London, was founded by the Romans as Londinium and has retained its medieval boundaries.
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A freedom of information request reveals a six-month trial at London transport hubs cost £320,000, used nearly 100 police hours, and generated a single incorrect alert.