By James Ashton The London Stock Exchange has been bruised and battered over the past two years. James Ashton, CEO of the Quoted Companies Alliance, warns the Chancellor the time is now for action JUST imagine the FTSE 100 stripped of its three largest constituents. What if the drugs giant AstraZeneca, energy major Shell and HSBC, one of the world’s largest lenders, decided to list their shares elsewhere? What if the trio departed the London market in the space of just a year? Even with the atmosphere febrile as gambling group Flutter Entertainment prepares to move its primary listing to New Y…