Hayley Atwell
as Margaret Schlegel
Tracey Ullman
as Aunt Juley Mund
Matthew Macfadyen
as Henry Wilcox
Philippa Coulthard
as Helen Schlegel
Alex Lawther
as Tibby Schlegel
Julia Ormond
as Ruth Wilcox
Joseph Quinn
as Leonard Bast
Rosalind Eleazar
as Jacky Bast
Joe Bannister
as Charles Wilcox
Bessie Carter
as Evie Wilcox
Jonah Hauer-King
as Paul Wilcox