A man has died after a building partially collapsed at a construction site on Grosvenor Square.
Police were called to the square in Mayfair at around 3.45 pm this afternoon.
The man, believed to be on his early 30s, who was working on the site, was pronounced dead at the scene.
At least one other person has been injured, police confirmed.
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The plaque at number 16 Cowley Street in Westminster marks the brown brick Georgian townhouse where Sir John lived for 31 years.
A man reportedly armed with several knives has been arrested in Whitehall on suspicion of planning a terror attack, police have said.
Metropolitan Police officer, Tom Harrison, has been crawling the course since the race began on Sunday morning.