Dr Stephen Pereira is calm; his voice is gentle and his speech, precise, as befits a psychiatrist and cognitive behaviour therapy specialist who attends to London workers’ mental health disorders.

Clients who have gone public about seeing him include Prince William’s brother-in-law James Middleton and the broadcaster Tom Bradby, who described in an interview how the insomnia that forced him to take almost five months off from ITV News At Ten was “10 times more frightening” than his experience of being shot.

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