Guest Stars Fiona Dolman as Sarah Barnaby Tamzin Malleson as Dr. Kate Wilding Andrea Lowe as Ava Gould Rebecca Front as Rev. Martha Hillcott Vincent Regan as Professor Philip Hamilton William Beck as Michael Dewar Ben Bailey Smith as Zach Lime William Postlethwaite as Noah Evans Roy Hudd as Victor Spencer Patricia Brake as Stella Spencer Gerard Horan as Ewan Evans Paul Copley as Frank Dewar Sarah Lochlan as Nancy Dewar Michael Jayston as Rev. Arthur Gould