Cockerell is a seasoned BBC reporter and does these things very well.
In the first episode, of three, he looked at the 'dark department': the Home Office. This week he will investigate what makes the Foreign Office tick and in the final programme he takes on HM Treasury.
If you are interested in the workings of the civil service, how the policy making class interact and the challenges of managing policy then the programme is definitely worth catching.
One striking thing is how the interior of the new Home Office building resembles the new DoSAC offices of The Thick of It. Make of that what you will.