Exclusive: Alex Salmond says SNP will back Labour unconditionally

“Would you like a glass of pink champagne?” asks Alex Salmond at 3.30pm, sounding very much like a man settling down for the afternoon. It’s Monday and Scotland’s former First Minister has cause to celebrate. He spent the previous day musing on television about the price he’d demand for the SNP supporting Ed Miliband in the House of Commons, and his thoughts dominate the front pages of the newspapers. There’s plenty of outrage at the idea of the SNP toying with England, and outrage is exactly what Salmond wanted. So champagne it is. Salmond has found himself an unlikely star of the Tory election campaign; the party this week released a cartoon showing his playing the whistle while Miliband dances. “I hesitate to offer any advice to Ed Miliband,” he says, “but next time he gets teased or attacked by the Tories for getting into Downing Street with the support of the nasty Nats, he should say: ‘the Prime Minister has just conceded the election.