For his final pre-election report, John Harris hits the knife-edge Tory/Labour marginal of Nuneaton – one of the small number of Middle English seats that will decide which party forms the next government. There's a huge billboard of Alex Salmond in the town centre, and as well as the usual talk about immigration and welfare, the streets are alive with nervous chatter about the SNP supposedly coming for England's money. But as Labour sticks to its tightly-controlled campaign and the Tories take their place next to local morris dancers, could that issue really swing the election?