Nicola Walker
as Hannah Stern
Deborah Findlay
as Ruth Defoe
Annabel Scholey
as Nina Defoe
Stephen Mangan
as Nathan Stern
Fiona Button
as Rose Defoe
Elizabeth Roberts
as Liv Stern
Barry Atsma
as Christie Carmichael
Chukwudi Iwuji
as Alex 'Zander' Hale
Kobna Holdbrook-Smith
as Vicar Glen Peters
Ian McElhinney
as Prof Ronnie
Rudi Dharmalingam
as James Cutler
Ellora Torchia
as Maggie Lavelle
Damien Molony
as Tyler Donaghue
Anna Chancellor
as Melanie Aickman
Alex Guersman
as Gael Carrillo
Meera Syal
as Goldie McKenzie
Stephen Tompkinson
as Davey McKenzie
Anthony Head
as Oscar Defoe
Donna Air
as Fi Hansen
Ben Bailey Smith
as Richie Hansen
Karen Bryson
as Leonora Hale
Lara Pulver
as Kate Pencastle
Mathew Baynton
as Rex Pope
Clarence Smith
as Felix Samuelson
Romina Cocca
as Valentina Carrillo
Manu Fullola
as Álvaro Carrillo
Toby Stephens
as Archie Moore
Jemima Rooper
as India Rossiter
Amanda Wilkin
as Sian
Lily Cole
as Bella
Tom Rhys Harries
as Gus
Marcello Walton
as Nicola Giustizia
Francesca De Martini
as Marianna Giustizia
Benjamin Wainwright
as Rory