English National Opera are due to reveal their latest project aimed at inspiring the next generation of opera-lovers later.
They have recruited ex-Blur frontman Damon Albarn to try to appeal to a younger audience.
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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.