The number of people in work in London has increased by 100,000, suggesting a big jobs boost from the Olympics.
Unemployment within the UK is now at its lowest level for a year, standing at 2.56 million.
In the three months to June, the number of people in work nationwide increased by 201,000, with half that rise coming in London.
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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.