Talulah Riley as Annabelle Fritton

Rupert Everett as Camilla Fritton / Captain Archibald Fritton / Fortnam Fritton

Gemma Arterton as Kelly Jones

David Tennant as Captain Lord Pomfrey / Sir Piers Pomfrey

Colin Firth as Geoffrey Thwaites

Jodie Whittaker as Beverly

Juno Temple as Celia

Tamsin Egerton as Chelsea Parker

Toby Jones as Bursar

Sarah Harding as Roxy

Zawe Ashton as Bianca

Montserrat Lombard as Zoe

Ella Smith as Lucy

Celia Imrie as Matron

Clara Paget as Bella

Gabriella Wilde as Saffy

Cloe Mackie as Tania

Holly Mackie as Tara

Christian Brassington as Peters

Tom Riley as Romeo

Georgia King as Juliet

Pip Torrens as Heathcoat Parker

Zara Treherne as Georgiana

Tallulah Evans as Jeminima

Lola Mae Loughran as Patience

Edith Thompson as Tabitha

Florence Grounds as Julie

Jessica Agombar as Jess

Harriet Bamford as Harriet

Jessica Bell as Beth

Daisy Tonge as Daisy

Katherine Parkinson as Physics Teacher

Freddie Fox as Head Boy

Salah Essayah as Pomfrey's Henchman

Colin Michael Carmichael as Police Officer

David Armand as Police Officer

Angus Barnett as Drunken Sailor

Giles New as Drunken Sailor

Steve Furst as Arbuthnott

Humphrey Ker as AD1 Member

Ricky Wilson as Rockstar

Denise Stephenson as Reporter

Paul Putner as Steve the Barman

Aran Bell as Headmaster

Ross Peacock as Globe Audience Member (uncredited)

Jessica Henwick as Globe Girl

Cloi Mckee as Tania