Colin Sutton and his team are trying to identify the white van they have discovered from an extensive trawl of CCTV images. But there are 25,000 possible vans that need to be checked and eliminated.

Cast: Martin Clunes, Katie Lyons, Celyn Jones, Claudie Blakley, Stephen Wight, Steve Furst, Jay Taylor, Steffan Rhodri, James Puddephatt, Lloyd Hutchinson, Nicholas Burns, Philip McGinley, Peter Forbes, Cornelius Booth, Christopher Fulford