I watched the dvd of this recently.
I am amazed it was not written or created by the people who made the Spooks British tv series,it has similar themes of government dishonesty and British-American relations.
It is a good conspiracy thriller that you will like if you like Homeland or Spooks.
But it could have been more cinematic but it has a big budget for a tv series.
You will like it if you don't worry too much that the story is unrealistic.