A pensioner who was murdered while apparently trying to help his neighbour has been named by police.
Graham Buck, 66, was found dead in the village of Little Gaddesden, near Berkhamsted in Hertfordshire, on Saturday afternoon.
Hertfordshire Police said that, although formal identification has not taken place, they believe he is Mr Buck - contrary to former reports which named him as Dennis Skinner.
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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.
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Metropolitan Police officer, Tom Harrison, has been crawling the course since the race began on Sunday morning.