The Series 8 cases include investigations into the murder of a Natural History Museum palaeontologist with plenty of enemies, apreviously unidentified vagrant, a charred body with potential links to an Albanian crime circle,a popular market stall holder, a bicycle courier in possession of a deadly package, an antiques dealer and a prominent scientist who disappeared while on a train to Paris.

But as UCOS dig deeper they begin to rattle cages at Whitehall and an ominous warning is issued.

DVD Extras: Behind the Scenes • Out Takes • Cast Filmographies • Subtitles