A small German city with a population of under a million has big ambitions. It wants to beat Paris to the top spot of financial centre of Europe. But can the city of Frankfurt attract the international bankers and their support work force when the UK leaves the European Union next year? Several international banks have already confirmed that staff will be moving to Frankfurt. Office space is secured and the international schools say banks are block booking places for pupils. But what will this mean for Frankfurt and its own residents who face soaring rents and property prices? And given a choice would the financial community really choose a regional German city over the French capital? Caroline Bayley heads to Frankfurt to find out…