The BBC have released a behind-the-scenes video that explores the making of The Snowmen. The confidentialette looks at how modern-day Bristol was transformed into Victorian London, with observations by Jenna-Louise Coleman (Clara), Matt Smith (The Doctor), Saul Metzstein (director) and Caroline Skinner (executive producer).

   The clip joins a number that have been released over the course of December, including interviews with Jenna, Dan Starkey (Strax) and Richard E Grant (Dr Simeon).