Police investigating the murder of a man in South Tottenham at the weekend have arrested a fourth man.
Officers executed a search warrant at a residential address in Tottenham in the early hours of this morning and arrested a man in his 20's on suspicion of murder.
He is currency in custody at a north London police station.
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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.