Guest Stars Anna Maxwell Martin as Kelly Major Rosie Cavaliero as DCS Dennett Amanda Payton as Dr. Alison Parfit Richard Gadd as Liam Cleasby Emily Lloyd-Saini as DI Ryle Steve Oram as DI Gilbert Michelle Greenidge as PC Williams (not Judy) Anna Leong Brophy voices The Voice of A.L. Richard Pepple as Kristof Montel Douglas as Cleasby's Supplier