Wow, that was a bad griffin. Hard to believe the same people do the effects on Doctor Who.
6x04 The Extremist
6x05 The Deal
This season of Spooks was famously promoted as "one long story", only then to be decried as a group of regular episodes with negligible links. Thus far, it seems to me that there is a bigger story progressing -- more so than the usual character arcs or what have you that the show has always had -- but that this is presented via a series of self-contained incidents occurring in that story, rather than as a 10-hour serial. In some respects, it's what 24's done for the past few seasons, it's just that there the single-episode nature of some incidents are disguised better.