The Queen and Members of Parliament will pay their respects today to the UK's war dead
Religious leaders and war veterans will also join them at the Cenotaph for a wreath-laying ceremony.
The service commemorates British and Commonwealth servicemen and women killed in world wars and other conflicts.
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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.