It's partly an education and training issue because adult psychiatry needs to take it on board.

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Psychologist Michael Wetter, who heads adult psychiatry at the site, employs 35 therapists to keep up with the demand and just a dozen psychiatrists who prescribe drugs.

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Dr Paul Blenkiron, consultant in adult psychiatry at Leeds and York Partnership NHS Foundation Trust, said the results showed that guided self-help is effective and is "something the NHS should be investing in".

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