There are some arresting moments, as when the moodily lit and terribly serious looking Rob Young starts brandishing a knife halfway through his speech; but there's nothing particularly illuminating about the answers. This is hardly surprising: the whole point of this particular device in the US was that it was deployed without warning in debates, giving a real chance for members of the public to catch their elected leaders on the hop.

In Downing Street's version, there's no sense of spontaneity, and very little that deviates far off message. And while it's fun to watch the Prime Minister simulate fond amusement at an insufferable little weasel who calls himself Jazza, you'd have to say it's another missed opportunity: if he'd just called him a self-satisfied git and moved on to the next question, he certainly would have secured my vote.