Guest Stars Andrew Frame as DI Ron Cook Scott Reid as DC Mick Clark Sean Gilder as CS George Harris Grace Calder as Heather Amos Millie Brady as Sally Jones Oliver Dimsdale as Peter Eaton Dorian Lough as DI Cresswell Richard Goulding as David Boutflour Tom Christian as Marcus McBride Amy Jayne as Abigail Amy McCallum as Tracey Brown Charlotte Bate as Lab Assistant Amanda Lawrence as Barbara Wilson George Whitehead as DI Bob Miller