The series has gone through several changes as it has evolved. In the first series there were 3 debates, a special guest interview, and viewers phone-in comments read out by a co-host. Halfway through the series the viewer comments and co-host were dropped. By the second series, the guest interview had also been dropped, and the show concentrated solely on the three debates.
By series three, the theme tune had also changed.
In series five, the panel was dropped, and all debates took place between a two-sided audience.