Guest Stars Sarah Solemani as Lizzie Dawn French as Linda Paul Cawley as Alan Emilia Fox as Scarlett Tom Basden as Noel Stephen Campbell Moore as Smoke David Calder as Mr. Reid Christina Chong as May Wu Benedict Wong as Lau Andrew Koji as Jason Dougray Scott as Walker Nick Moran as Stevens Charles Walker-Wise as David Dan Skinner as D.I. Ireland Rufus Jones as D.S. Brick Jim Howick as Chris Claire Lams as Kerry Brendan Patricks as Ed