Guest Stars Patrick Walshe McBride as Sebastian Brudenell Tomos Eames as DS Joe Keeler Amber Aga as DI Christina Marlowe Darren Evans as Spider Ciaran Griffiths as William 'Billy the Brick' Porters James Dreyfus as Claude Mortimer Simon Lowe as Florian Fortescue Alice Barlow as Bianca Percy Leon Williams as Anthony Percy Lydia Lakemore as Mercy