Boris Johnson is expected to visit the Crossrail site at Tottenham court road later.
The mayor will be questioned on yesterday's government spending review.
A commitment of £2 million was made to look into the north-south rail link for cross rail 2 in yesterday's spending report by George Osborne.
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Hundreds of thousands of people turned out for the Notting Hill Carnival today with the weather just managing to hold off.
A yellow weather warning has been issued for London today and tomorrow with "thundery downpours" expected.
Police are appealing for witnesses after a crash involving a car and three pedestrians in Islington.