Such an inconsistent series of episodes - a few quite good, most OK, some sheer farce, barely up to am-dram-panto standard ... and yet strangly addictive, wondering if the next episode will be worth watching or another big let-down. The entire premise is weird: a dozen spooks backed by a bevvy of silent extras, all studiously avoiding the limelight, and supported by an invisible army of tech wizzards capable of, of, well, whatever fantastic nonsense is required for the sake of the plot. Invisible, undetectable two-way comms - no problem. Instant teleportation anywhere in the city, why not? Trackers that go ping as the red dot crosses the map like an 80s video game, sure. A backpack bomb complete with LED countdown, naturally! I almost expected Bruce Willis to make a guest appearance, just behind Mr Bean.
