London prices have risen by 10.9%, according to latest Land Registry figures, the fastest rate since July 2010.
The average price of a home in the capital now stands at £409, 881.
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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.