nicola sturgeon will today launch an extraordinary bid to ` lead the uk ' as she unveils a string of policies apparently tailor-made for a power-sharing deal with labour .
the snp leader will unveil a manifesto including proposals for british foreign policy , welfare payments , energy bills and english university tuition fees .
others are calculated to drag a minority labour government to the left , including halting the roll-out of iain duncan smith 's popular changes to benefits and cancelling the trident nuclear weapons system .