Guest Stars Fiona Dolman as Sarah Barnaby Manjinder Virk as Dr. Kam Karimore Adrian Scarborough as Tony Pitt Saskia Reeves as Summer Pitt Cherie Lunghi as Alexandra Monkford Cara Horgan as Rachel Monkford Ramon Tikaram as Lance Auden Charlotte Beaumont as Helena Pitt David Bamber as Daniel Fargo Michael Wildman as Killion Staples Denis Lill as Simeon Rowling John Hollingworth as Brin Dunne David Gant as Brandon Monkford Cat Simmons as Clemmy Staples Jolyon Coy as Fabian Monkford