A postmortem will held today on a 19-year-old man who was shot dead in Clapton on Saturday.
A second man was also hurt in the attack but is in a stable condition.
No arrests have yet been made and the police are appealing for any information.
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A guarantee from City Hall to bankroll the annual £2-3m bill was a key planning condition imposed by Westminster and Lambeth councils.
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.