Financial Transaction Tax and Economic and Monetary Union

I just want to clarify that my position and that of my party is that a financial transaction tax could make a useful contribution to world development if it were introduced across all the global financial sectors. Is it the Labour party’s position that if the EU proposal, which, as constituted, would affect Paris, Frankfurt and perhaps London, were to go ahead, Labour would support it despite it not also applying to New York, Zurich, Shanghai and everywhere else?