Stephen Smith has been spending much of the election campaign ensconced in Donington Park to find out what makes Motorway Man and Woman - a key psephological group identified as holding the power to swing Thursday's group - tick.

This week he's been joined by pop trio Scouting for Girls and by the writer Will Self - who reveals that he was once a motorway man himself.

Watch an extended interview with Scouting For Girls and see them perform live Broadcast on Tuesday 4 May 2010.