When John Prescott used to wax garrulous about a ‘superhighway’ from Hull to Liverpool, everyone assumed it was a wheeze to spray southern taxpayers’ money across the region he saw as his power base. When George Osborne decided to ‘start a conversation’ this week about a super-city along the same route, an English equivalent of Germany’s Ruhr valley connected by yet another decades-away high-speed rail project, everyone assumed it was about recapturing votes in northern conurbations where Tory MPs and councillors are an endangered species.