The Prince of Wales and the Duchess of Cornwall have re-visited Croydon, a year after it was hit by some of the worst of last summer's rioting.
The royal couple first toured the area in the days following the violence in which dozens of homes and businesses were wrecked as Phil Bayles 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.