CLEAN : Britains UKIP set for landmark poll win

The video discusses the potential outcomes of a by-election, suggesting that while UKIP may win initially, their long-term impact is uncertain. It highlights voter discontent with mainstream parties, using by-elections as protest votes. Immigration is discussed as a metaphor for broader political dissatisfaction. The video questions whether UKIP can maintain their success in future general elections.

What does the speaker mean by a 'free protest vote' in relation to by-elections?

What doubts does the speaker express about UKIP's future as a political force?