Sheridan Smith has confessed to 'losing her mind' while filming her new Liverpool-set crime drama for BBC One, The Cage. Penned by Tony Schumacher (The Responder), Smith plays casino worker and single mother Leanne, who begins pilfering cash from her workplace, The Envoy. Upon discovering that the casino's manager, gambling addict Matty (portrayed by Michael Socha), has been doing exactly the same thing, their lives are sent hurtling on a perilous collision course straight into the clutches of