Comedienne Angie Le Mar has called the late Felix Dexter a comedy "genius".
She added: "He was clever, intelligent and funny but also so unassuming."
Felix, who was just 52, passed away yesterday after a battle with cancer.
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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.