Although billed as an action-fest, this is actually a far more cerebral piece. With car chases.
David Morrissey seems to have cornered the market in family men having midlife crisis (see also "The 7.39"), but this role allows him to show both his sensitive side and imposing physicality. The acting highlights have to be his scenes with the equally great Ian Hart, who he grew up with on Merseyside but had never acted with until now.
The rest of the cast are equally on top of their game; with Lee Ross and Chris Coghill providing much needed comic relief. And the first two parts, with their unrelenting pace, need it at times to allow the viewers to draw breath.
By the final episode, the various interconnecting plots have hit the rumble strips a little, meaning this is merely great rather than mind- blowing entertainment. But compared to much of what counts as "Original British Drama" on our dumbed-down BBC, it's top-notch.