the labour leader insists snp mps will not be able to dictate policy .
insisted the snp would not ` call the shots ' if there was a hung parliament .
comes after nicola sturgeon said he could only govern with snp support .
she promised to use snp influence to increase government spending .
mr miliband also accepted his doom-laden claims about jobs were wrong .
before the recent jobs boom he said millions would be put on the dole .