W1A

Hugh Bonneville

as Ian Fletcher

Monica Dolan

as Tracey Pritchard

Jessica Hynes

as Siobhan Sharpe

Sarah Parish

as Anna Rampton

Jason Watkins

as Simon Harwood

Hugh Skinner

as Will Humphries

David Westhead

as Neil Reid

Nina Sosanya

as Lucy Freeman

Jonathan Bailey

as Jack Patterson

Ivan Gonzalez

as Jerry Guildencrantz

Ophelia Lovibond

as Izzy Gould

Max Olesker

as Ben Rosenstern

Rufus Jones

as David Wilkes

David Tennant

as Narrator (voice)