THE SNP has urged television broadcasters to rethink their plans to exclude the party from any leaders' debates during next year's General Election campaign.

Angus Robertson, the Nationalists' Westminster leader, spoke out after it was revealed programme makers want to give Ukip a platform on the proposed shows. It comes as the threat of legal action from the SNP, if it is left out, hangs over the mooted TV specials.

Mr Robertson said: "The broadcasters need to go back and think properly about what these proposed debates are supposed to be about.

"At the last election the argument for excluding SNP and other voices was they were about who would be the next Prime Minister, but nobody can seriously be suggesting Nigel Farage will be taking that office in May.

"The inclusion of Ukip in these proposals means there is no way the SNP - the third biggest party in the UK - can be excluded."

The MP had earlier made clear legal action to block the proposals, as the SNP tried unsuccessfully in 2010, remained an option if negotiation did not lead to changes.

"We will not rule out any opportunities to get fairness in broadcasting coverage in the run-up to the election," he said, as he argued the current proposals were "unacceptable".

Scottish Secretary Alistair Carmichael said: "The SNP will always come forward with complaints like this."

The Liberal Democrats want the TV debates next year to be in the same format as in 2010, with three debates involving the leaders of the three main UK parties over three weeks.

Mr Carmichael said: "We are a UK-wide party. We stand candidates across the United Kingdom, they don't and they seem to ignore quite conveniently the fact there is always within Scotland accommodation made for debates that do completely respect the position of the SNP."

A BBC Scotland spokesman said: "In Scotland, the BBC is proposing a debate, in peak time on BBC1, involving the leaders of the SNP, Scottish Labour, Scottish Conservatives and Scottish Liberal Democrats parties. We have written to the parties to begin discussions about our proposals and we will ensure impartiality during the election in Scotland."