Awarenessof the disease is still dangerously low, despite being the most commoncause of cancer death in men in the UK, killing nearly as many men every year asbreast cancer kills women.
A worrying 70 per cent of men know nothing about the disease or its symptoms.
More top news
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.