By Charlie Conchie The City minister doubled down on the Treasury’s contentious tax on share trading yesterday after a group of the UK’s top fintech firms called for the charge to be dropped. Speaking withCity A.M. at the Innovate Finance Global Summit yesterday, the Economic Secretary to the Treasury, Bim Afolami, said ditching the charge was not a priority for the government despite mounting anger in the City over recent months. “Look, I want all taxes gone. I’ve heard it from many people in the City over the last year or so and the Chancellor is very clear that he keeps all taxes under revi…