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Kate Silverton invites the smaller parties to take on the big three over issues that they say have not had proper attention like immigration, pensions and Trident.

During the debate, Labour, the Conservatives and Liberal Democrats battle it out over the economy.

The Green Party takes on the big three over the funding of public services.

The SNP questions Labour, the Conservatives and the Liberal Democrats over the necessity of the Trident nuclear deterrent.

The British National Party debates immigration.

UKIP put Labour, the Conservatives and the Liberal Democrats in the hot seat over Europe.

And, Plaid Cymru focus on pensions and ask the big three parties if they'll raise the basic rate.