The Metropolitan Police have announced that 400 extra officers will patrol the West End on Thursday, Friday and Saturday nights.
It is part of a New York-style policing crackdown, which aims to target crime and anti-social behaviour over the next six months.
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Detectives in Westminster are investigating after the man was discovered on the Route 189 bus in Marylebone shortly after midnight.
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.