London is spread out beneath us from the 32nd floor of The Shard. We are looking out over St Paul’s Cathedral, the City and, round the bend of the Thames, Tate Modern and the London Eye. “There’s religion, there’s power, there’s tourism,” says my guest. “It gives you this funny perspective, being up here. It tells you something about London.”

Lucy Prebble chose The Shard because her latest play, A Very Expensive Poison, about the murder of Alexander Litvinenko, is set against the backdrop of this moneyed international capital — and also because, well, “Why not?”

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