I'm actually really enjoying "How Do You Want Me?" - written by Simon Nye and starring Dylan Moran, Charlotte Coleman, Emma Chambers, Mark Heap and Peter Serafinowicz.
But yes, Marc! I love how you can count on him to turn up in just about anything. He's had so much work over the years. John Simm recently said in his LoM video diary (warning: some s2 spoilers) that he and Marc are friends, which I just think is brilliant.