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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Before the final declaration on Friday, the Conservative candidate looked set to lose the City Hall race to Labour's Sadiq Khan.
The Tooting MP has been the frontrunner in the counting process ahead of Tory challenger Zac Goldsmith.
It's not just London where elections have been taking place today. There were council elections taking place across the home counties.