By Charlie Conchie The Chancellor Jeremy Hunt is facing a potential clash with the Square Mile in the coming weeks after the Treasury doubled down on a divisive tax on share trading. As ministers and regulators push through City reforms to try and revive London’s beleaguered capital markets, a 0.5 per cent stamp duty on shares has been seen as an outlier by analysts despite a clamour of calls for change. The charge is currently slapped on any share transaction for a company incorporated in the UK and brings in around £3.3bn to the Treasury’s coffers every year, effectively 0.3 per cent of the …