Nicola Walker Hannah Actor Stephen Mangan Nathan Actor Deborah Findlay Ruth Actor Annabel Scholey Nina Actor Fiona Button Rose Actor Barry Atsma Christie Actor Donna Air Fi Hansen Actor Rudi Dharmalingam James Actor Chukwudi Iwuji Zander Actor Elizabeth Roberts Liv Stern Actor Toby Oliver Vinnie Stern Actor Mollie Cowen Tilly Stern Actor Frances Barber Misty Brodeur Actor Damien Molony Tyler Actor Ian McElhinney Prof Ronnie Actor Ellora Torchia Maggie Actor Ben Bailey Smith Richie Hansen Actor David Coburn Jack Brodeur Actor Amaka Okafor Chloe Actor Abi Morgan Writer, Executive Producer Jane Featherstone Executive Producer Lucy Dyke Executive Producer Natasha Romaniuk Producer Paula van der Oest Director