Samuel L Jackson is to launch a new London charity later. One For The Boys aims to raise awareness about male forms of cancer and getting men to change their mindsets when it comes to prioritising their health.
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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.