Conservative Lambeth Councillor Julia Memery told Liz Wickham that it's a civil case and they expect an eviction by Monday at the latest, if the travellers have not moved on voluntarily by then.
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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.
A man reportedly armed with several knives has been arrested in Whitehall on suspicion of planning a terror attack, police have said.