London Fire Brigade has warned residents near the Docklands not to be alarmed by the number of response teams in the area, as part of it's largest ever training exercise. Two hundred and twenty emergency services teams are there to test the response to an air crash.
The scene has been simulated with a real Boeing 737 aircraft, buried in tonnes of rubble. One hundred actors are playing the part of casualties.
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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.