The Queen, the Duke of Edinburgh and the Duchess of Cambridge visited Baker Street to mark the 150th anniversary of the Underground. They met Tube staff, spoke to Sherlock Holmes and unveiled a plaque on a train.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants