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Kelan Pannell - Young Sidney, Janette Scott - Sidney's Mother (archive footage) , Danny Huston - Lawrence Maddox, Simon Pegg - Sidney Young, Megan Fox - Sophie Maes, Gillian Anderson - Eleanor Johnson, Kelly Jo Charge - Apollo Awards Presenter, Christian Maier Smith - Apollo Awards Guest, Katherine Parkinson - PR Woman, Felicity Montagu - Clipboard Nazi, Thandiwe Newton - Thandie Newton (as Thandie Newton) , John Lightbody - Assistant Hotel Manager, Ian Bonar - Post Modern Review Staff, James Corden - Post Modern Review Staff, Fenella Woolgar - Post Modern Review Staff