[spoilers] what is the best series of spooks

[Nia M]

Another one for S7. The introduction of Lucas, the return of Ros, Ros&Lucas making an amazing team, 7.5, Ros and Jo's conversation on the roof, the story arc, the cliffhanger at the end... It was also the first series I saw, which I suppose has a big impact

I've not seen many of the early series recently though, so when I get around to my rewatch I may well change my mind.