Guest Stars Alex Beckett as Barney Lumsden Joel Fry as Karl Marx Sara Pascoe as Coco Lomax Tom Basden as Dan Shepherd Samuel West as Richard "Dick" Cartwright Asim Chaudhry as Security Guard (NBH) Dan Mersh as Man in Broadcasting House Andrew Brooke as Dave Green Clare Wille as Camilla Ford Marcus Onilude as Security Guard (OBH) Sophie Fletcher as Alice