On a private island 20 minutes by helicopter from central London, a hovercraft sits on the lawn of a turreted Edwardian manor house as swallows swoop around.

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</p><p class='TableClas'>Trees and wildflowers line a lane that leads to a cluster of buildings that house a pool table, a 12-seat movie theater and an art studio. A yacht is moored nearby. 
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</p><p class='TableClas'>The island isn't a country hideaway. It's the Causeway Retreat, a mental health and addiction center that charges as much as 

Bankers use secret clinics to beat breakdowns

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