article_snippet.sent: But Cameron warned of the 'frightening' prospect of the SNP holding Labour to ransom and demanding they ditch new roads and hospitals in England, Wales and Northern Ireland.
article_snippet.sent: Mr Cameron warned that with the SNP .
article_snippet.sent: In September's referendum, 55 per cent of people voted against independence, but since then support for the SNP has soared.
article_snippet.sent: Latest polls suggest more than half of Scots plan to vote for the SNP, robbing Labour of dozens of seats north of the border.
article_snippet.sent: I've got to persuade people that the SNP in the House of Commons after the election will not be any kind of disruptive force.
article_snippet.sent: We want to be constructive, to get better politics coming out of the Westminster system. '
article_snippet.sent: As long as Scotland remains part of the Westminster system, it matters to people that we get good decisions out of the Westminster system, and I want the SNP to play a positive part in improving politics at Westminster for people right across the UK.'
article_snippet.sent: But Mr Cameron warned that if Labour is forced to rely on the SNP to pass laws and budgets, England, Wales and Northern Ireland will pay the price.
article_snippet.sent: Mr Cameron warned that with the SNP calling ths shots, the rest of the United Kingdom – England, Wales, Northern Ireland, wouldn't get a look-in .
article_snippet.sent: The Prime Minister, who described himself as a 'fundamental believer in the United Kingdom', told Andrew Marr: 'This would be the first time on our history that a group of nationalists from one part of our country would be involved in altering the direction of the government of our country.
article_snippet.sent: the rest of the United Kingdom – England, Wales, Northern Irelandthe United Kingdom – England, wouldn't get a look-in. '
article_snippet.sent: A recent TNS survey showed the SNP has almost doubled the SNP lead over Labour in a month, with 52 per cent now backing Ms Sturgeon with only 24 per cent of Scots planning to vote for Mr Miliband .
article_snippet.sent: Mr Cameron said: 'the SNP is a party that doesn't want to come to Westminster to contribute to a government, the SNP wants to come to Westminster to break up our country. '
article_snippet.sent: Imagine what it would be like with SNP MPs.'
highlights_snippet.sent: SNP holding Labour to ransom means rest of UK 'wouldn't get a look in'
  