This month in the Guru: Rhianna Dhillon visits the set of BBC's Luther to speak with make-up designer Catherine Scoble (This Is England), who explains what happens every day before the shooting starts. Matt Hill speaks to prosthetics advisor Kristyan Mallett, who talks about transforming Eddie Redmayne into Stephen Hawking in The Theory Of Everything. Also inside: how to make the perfect fake blood. Dig in.