Sir Richard Branson and Princess Beatrice have spoken to 12,000 children at a Wembley Arena charity event to encourage volunteering and fundraising.
Mayor's new pollution rules
New rules on vehicle pollution are in place across London from today.
You could face a £200 fine if the vehicle is more than 10 years old and doesn't meet legal limits.
A campaign to turn off engines if you're in a queue begins later this month.
Boris Johnson's office is insisting progress is being made to cut air pollution after claims Britain's fifty worst areas for it are all in London.
A new statue has been unveiled on the fourth plinth in Trafalgar Square.
A fourth person has been arrested on suspicion of murdering a 15 year-old boy who was stabbed in Islington.
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