Gatwick Airport says that there should not be any delays to flights leaving UK airports.
A spokesman added:
We are experiencing similar (problems) to the rest of the airports, and we are working to get people through.People should be able to get off the plane, it is those coming through the immigration process which it is frustrating.
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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.