Jessica Hyde

Fiona O'Shaughnessy

Wilson Wilson

Adeel Akhtar

Michael Dugdale

Paul Higgins

Arby

Neil Maskell

Ian Johnson

Nathan Stewart-Jarrett

Becky

Alexandra Roach

Grant Leetham

Oliver Woollford

The Assistant

James Fox

Milner

Geraldine James

Geoff Lawson

Alistair Petrie

Jen Dugdale

Ruth Gemmell

Lee

Paul Ready

Alice Ward

Emilia Jones

Anya Levchenko

Anna Madeley

Leah Gorsand / Leah

Sylvestra Le Touzel

Conran Letts

Stephen Rea

Anton

Ian McDiarmid

Christian Donaldson

Michael Maloney

Professor Donaldson

Simon McBurney

Joe

Gerard Monaco

Marius

Emil Hoștină

Bev

Eleanor Matsuura

Grant's Mum

Sarah Churm

Paul

Sacha Dhawan

Ross

Allan Corduner

Bejan / Bejan Chervo

Mark Stobbart

Alice's Mum / Mrs. Ward

Teresa Banham

Monroe / Lane Monroe

Mitchell Mullen

Terrence

Steven Robertson

Headteacher

Dan Tetsell

Roy

Paapa Essiedu

Airey Naeve

Tim McInnerny

Niall

Corey Johnson

Tony Bradley

Kevin Eldon

Dobri Gorski

David Calder

Ben

Will Attenborough

CIA Woman

Diana Hardcastle

Danny "The Tramp

Alan Williams

Detective Inspector Joshua Reynolds

Michael Smiley

Greg Ashby

Oliver Dimsdale

Philip Carvel

Tom Burke

William Kaye

Lloyd Hutchinson

Jack Tate

David Sibley

Milner

Rose Leslie

Brosca

Anca-Ioana Androne

The Assistant

Ed Birch

Tom

Trystan Gravelle

Mr. Omida

Kevin Trainor

Dr. Isherwood

Clive Wood

Christos

William Belchambers

Young Jessica

Aine Garvey

Amanda

Pixie Davies

Tess

Diane Morgan

Bridget

Juliet Cowan

Ben's Mum

Candida Gubbins

Ben's Dad

Alex Lowe

Roy

Ṣọpẹ́ Dìrísù

Detective Leeman

Gary Cargill

Marcus

Simon Farnaby

Diane

Hermione Gulliford

Milton Wilson

Stewart Scudamore

Large Man

Gavin Spokes

Clerk

Danny Kirrane

Lawyer

Andrew Readman

Corporal

Ben Bishop

Detective Richmond

Jay Simpson

Young Arby

Harley Rooney

Young Arby

Mason Rooney

Shenley Nurse

Velile Tshabalala

Soldier

Michael Yare

Scientist

Ian Porter

Midwife

Lorna Gayle

Danny Gorsand

David Quilter

Holding Facility Guard

Solomon Mousley

Mino Pecorelli (as Vincenzo Ferrara)

Vincenzo Ferrera

MI6 Agent

Steve Leighton

Well Dressed Drunk

Mark Bagnall