The battle for power in Britain has long been a bare-knuckle fight between Labour and the Conservatives. But during the current election campaign, the Liberal Democrats have joined the scrap with a vigour which suggests old political certainties could yet be knocked down.
Stephen Sackur talks to three doughty political fighters: former ministers, Tony Benn for Labour and Norman Fowler for the Conservatives, and the former leader of the Liberals David Steel. Could this election change the face of British politics?
You can watch the full interview on Wednesday 21st April 2010 on BBC World News at 03:30, 08:30, 15:30, 19:30 GMT and on the News Channel at 02:30 and 04:30 BST.
And on Thursday 22nd April on the News Channel at 23:30 BST.