The Metropolitan Police Service is urging members of the public to use the 999 emergency number sensibly over Christmas, traditionally their busiest time of the year.
To encourage people to use the number sensibly, they will be releasing four calls made over the last year which did not require a police response, including a report of a dead squirrel
The Met received 25,749 so-called 'nuisance calls' last year and have received 18,333 nuisance calls so far this year.
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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.