Rose Byrne as Nat

Rafe Spall as Josh

Simon Baker as Guy

Anna Faris as Chloe

Stephen Merchant as Danny

Minnie Driver as Naomi

Jason Flemyng as Hugh

Jane Asher as Diana

Terence Harvey as Alec

Nigel Planer as Brian

Clare Higgins as Elaine

Olivia Colman as Linda

Alisha Bailey as Kate

Kerry Howard as Clare

Daisy Haggard as Helen

Tim Key as Alan

Djalenga Scott as Alexandra

Joseph Millson as Charlie

Sue Wallace as Janet

Hasina Haque as Preeta

Pandora Colin as Jane

Anna Skellern as Claudia

Alex Macqueen as Minister

Matilda Thykier as Bridesmaid

Maisy Mazer as Bridesmaid

Kevin Moore as Toastmaster

Daisy Donovan as Partygoer

William Andrews as Joke Thief

Derek Hutchinson as Business Guy

Martin Trenaman as HR Man

Dustin Demri-Burns as Dove Violinist

Clare Welch as Granny

Audrey Nicholson as Woman with Taxi

Peter Mair as Man with Taxi

Martin John King as Roger (uncredited)

Bron James as Wedding Guest (uncredited)

Shaun Lucas as Wedding Guest (uncredited)

Glen Stanway as Wedding Guest (uncredited)

Debra Leigh-Taylor as Wedding Guest / Partygoer (uncredited)

Paul Blackwell as Wedding Waiter (uncredited)

Glenn Webster as Eurostar Staff (uncredited)

Salem Hanna as Bonfire Partygoer (uncredited)

Eva Dagoo as Fireworks Guest (uncredited)

Marcus Sinclair as Pool Bar Patron (uncredited)

Tony Montalbano as Clubber (uncredited)

Shane Salter as Christmas Party Guest (uncredited)

June Smith as Christmas Party Reveler (uncredited)

Simone Liebman as Client (uncredited)

João Costa Menezes as Client (uncredited)

Senem Temiz as Client (uncredited)

Craig Izzard as Customer (uncredited)

Leon Corbin as Passerby (uncredited)