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