There are some shows which sound dodgy on paper but prove themselves to be better than they sound. Life on Mars is not one of those shows. It starts with such a fantastic concept - 21st Century Police Officer goes back to the 70s - that everyone involved must have known they had a chance of making something truly great. While the first episode was not perfect - in particular the opening 10 minutes was overly crammed with exposition masquerading as dialogue - it is already fulfilling much of its initial promise. As well as the superb production values that one would expect from the producers of Spooks and Hustle, this show has set up two intriguing ongoing mysteries both of which ought to be well worth watching unspool over the next seven weeks.