A researcher at London Metropolitan University has been suspended after it emerged he was involved the bombing of the Israeli Embassy.
Palestinian-born Jawad Botmeh was sentenced to 20 years in jail in 1996 after he was found guilty of conspiracy to cause explosions in the UK.
A car bomb exploded outside the embassy in London in 1994 injuring 14 people.
Botmeh was released from jail in 2008 and had been working as a research manager at London Met's Working Lives Research Institute for five years.
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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.