Can somebody recommend really good psychiatrist in London?

My boyfriend is depressed and has anxiety issues. He's been attending group therapy for the last 8 months, before he was seeing one to one therapist. He feels that group therapy is not for him and he's not really happy with his therapist. He actually feels worse since started group therapy. He needs some guidance, he's very desperate. I want to help him so much, does somebody know really good psychiatrist, who can help him? Thank you for all your answers.

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