Arsene Wenger says he was close to signing Eden Hazard from Lille before Chelsea came along with a better offer.
The Arsenal boss discussed the deal with Hazard's agent at his home, but he could not compete with Chelsea's financial power.
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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.