Green Party Assembly Member, Baroness Jones, became embroiled in a row with Boris Johnson at Mayor's Question Time after telling him to "apologise to Londoners" for his record on cycling safety, and his "flawed and dangerous (cycling) policies".
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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.