By Mark Kleinman Mark Kleinman is Sky News’ City Editor and is the man who gets the City talking in his weekly City A.M. column. This week he tackles Labour and the Tories’ attempts to win over business, IP Group investors and Thames Water. Labour and Tories yet win business overLet battle commence. Rishi Sunak’s decision to call a snap summer general election achieved a rare thing in politics: uniting business leaders, economists and his own (diminishing) ranks of MPs in bemusement. Coming the day after statistics revealed inflation coming back to within reach of the Bank of England’s two per…