From NetFlix:

A British version of CSI, this International Emmy-winning series follows the cold case unit, a team of top police investigators who use modern techniques to solve old murder cases. Led by Det. Peter Boyd (Trevor Eve), the group includes cops and scientists. They all combine forensics, psychology and old-fashioned police work to get results, but their jobs are on the lin, as they’ve been given only one year to prove their worth.

AUGUST 2019 UPDATE:

From Amazon Prime you can now stream 9 seasons.  Each season has between 8 and 12 episodes. Each self-contained story consists of 2 episodes.

Because many of the stories are quite GRIM, Kathy stopped watching.  But the plots are so gripping that I could not stop watching. Finally Boyd is forced to retire and the series ends.

In contrast with most British crime series, the crime solving team of characters remained constant except for one notable staff death and her replacement.

ORIGINAL REVIEW:

So far on DVD you can watch 4 seasons of this wonderful British detective series. In my opinion, this British version is better than the American CSI. You get to know and enjoy all the personalities. There are many seasons not yet available from NetFlix. If you go to Wikipedia, you can get a rundown of ALL the episodes from all the years. You will discover there that over the long series the characters change (some die, etc). The one charater that is constant is Det. Peter Boyd whose personality is one of an impetuous almost bullying man who after a while goes through psychoanalysis to improve his relations with his subordinates.

Kathy and I could not wait to see each episode. Enjoy!