Matthew Macfadyen Henry Wilcox Actor Hayley Atwell Margaret Schlegel Actor Philippa Coulthard Helen Schlegel Actor Alex Lawther Tibby Schlegel Actor Joe Bannister Charles Wilcox Actor Donna Banya Annie Actor Tracey Ullman Aunt Juley Mund Actor Bessie Carter Evie Wilcox Actor Joseph Quinn Leonard Bast Actor Rosalind Eleazar Jacky Bast Actor William Belchambers Burton Guest Star Estrid Barton Austrian Housekeeper Guest Star Miles Jupp Percy Cahill Guest Star Sandra Voe Miss Avery Guest Star Yolanda Kettle Dolly Wilcox Guest Star Andrew Bridgmont Swanage Doctor Guest Star Gavin Brocker Crane Guest Star Laura Hastings-Smith Producer Hettie MacDonald Director Kenneth Lonergan Writer Colin Callender Executive Producer Sophie Gardiner Executive Producer Scott Huff Executive Producer Joshua D. Maurer Executive Producer