International report

UK election series part 5/5

Audio 04:00
Voters arrive to cast their ballots at a polling station set up at the local football club in Marlow, central Britain, 7 May 2015.
Voters arrive to cast their ballots at a polling station set up at the local football club in Marlow, central Britain, 7 May 2015. Reuters/Eddie Keogh

Britain headed to the polls on Thursday to elect a new parliament and forecasters said the result is too close to call.  The two main parties, the Conservatives and Labour, have seen unprecedented challenges from smaller parties in this campaign, leading some to proclaim the death of two-party politics in Britain. So why are some of the smaller parties attracting so many supporters?