Schoolchildren from across London took part in a memorial service in Belgium today alongside the Duke of Edinburgh, where they carried sacred soil from the battlefields of Flanders under the Menin Gate.
Some of the children said they were 'touched' by the ceremony - as Nina Hossain reports.
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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.