Armando Iannucci and Chris Morris are two of the biggest names in biting, scathing, bring-your-brain-to-this comedy, and Billy is the main responsible for editing a huge chunk of their output including The Thick of It, I'm Alan Partridge, Veep, Four Lions, Brass Eye and The Day Shall Come. AND, he's the main who stitched together the stupendous Stan and Ollie and the blood-chilling Ghost Stories. He talks about how he got there from a career start as an in-debt dispatch rider and a chance meeting in a pub.