Guest Stars Anjli Mohindra as WPC Megan Waters Dominik Tiefenthaler as Walti Merian Polly Walker as Monica Wayfield William Ash as Henry Appley Danny Huston as Nick Waingrow Jason Done as Dennis Jonathan Ojinnaka as Bald Man Isabella Pappas as Sadie Waingrow Rebecca Callard as Caitlin Graece Colin Coombs as Arne Durnst