Main Cast:
* Sean Biggerstaff as Ben
* Emilia Fox as Suzanne
* Chris O'Dowd as Brian
* Stuart Brennan as Sheldon
* Eddie Marsan as Bruce
* Ken Stott as Mr. Lewis
Supporting Cast:
* Michael Sheen as The Man
* Georgina Chapman as Sarah
* David Bradley as Shopkeeper
* Roger Lloyd-Pack as Bernard
* Sarah Alexander as Ben's Mother
* Alice Eve as Shop Assistant
This list includes most of the notable roles. You can find a more extensive list on websites like IMDb.