New figures show the largest ever demand for food from the capital's foodbanks. The Trussell Trust says 42,000 people in London have received at least three days emergency food over the last year, almost triple the number who needed help in 2011-12.
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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.