Just finished the last episode of series three, and was reminded why this is my favourite show of all time. I think the comparisons to 24 are quite unfair--they both deal with terrorism, but the similarities end there. Spooks is far more cerebral, and spends more effort on character and plot development.

Unlike other reviewers, I felt series three was every bit as good (and in many ways even better) than the previous two. The departure of several main characters was handled exceedingly well, and while they'll be missed, I think their replacements are quite strong and as such, the transition has been quite smooth. Kudos! (Er, no pun intended)