Posh was first peformed at The Royal Court Jerwood Theatre Downstairs, Sloane Square, London on 9 April 2010 with the following cast (in order of appearance):

JEREMY, Simon Shepherd

GUY BELLINGFIELD, Joshua McGuire

CHRIS, Daniel Ryan

GEORGE BALFOUR, Richard Goulding

TOBY MAITLAND, Jolyon Coy

ED MONTGOMERY, Kit Harington

HARRY VILLIERS, Harry Hadden-Paton

ALISTAIR RYLE, Leo Bill

HUGO FRASER-TYRWHITT, David Dawson

MILES RICHARDS, James Norton

DIMITRI MITROPOULOS, Henry Lloyd-Hughes

JAMES LEIGHTON-MASTERS, Tom Mison

RACHEL, Fiona Button

CHARLIE, Charlotte Lucas

Director, Lyndsey Turner

Designer, Anthony Ward

Lighting Designer, Paule Constable

Sound Designer, David McSeveney

Musical Director, James Fortune