Professional boundaries "became blurred" at Scotland Yard as the force made "imprudent decisions" and showed "poor judgment" in hiring a former News of the World boss as a PR consultant, the police watchdog said today.
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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.