'Informer' has a lot going for it: a complex plot, a bold structure, and the great Paddy Considine in the lead role. But I struggled with this BBC series. Firstly, I found it genuinely hard to follow what was going on. Secondly,it seemed over-cooked, with some of its tough-as-nails dialogue verging on parody. I simply didn't get a feeling that anyone was acting out of any ordinary, plausible motivation, or that undercover operations really work in this way. Perhaps I simply thought it less clever than it thought it was.