By Paul Swinney London’s productivity has flatlined since the financial crisis and the entire economy is suffering as a result. Changes to planning and tax raising powers could help change this, says Paul Swinney To get the UK out of its economic coma, the next government will need to shake the capital awake. As is well known, London’s economy is better performing than the rest of the UK. A London worker produces as much in 3.5 days as workers in the rest of the country do in a week. And it accounts for a quarter of the UK’s economic output. Driven from a position of fairness, this leads to ca…