Brexit risks taking multi-trillion euro trading from London

By John O'Donnell, Huw Jones and John Geddie FRANKFURT/LONDON (Reuters) - If Britons vote to leave the EU, London's financial centre faces losing one of its top money spinners - the trade in trillions of euros in derivatives - and the European Central Bank will be pushing hard for the business to move onto its patch. According to euro zone central bank officials, the ECB is determined to tackle an anomaly dating from 1999 when Britain opted out of the euro's launch: a dominant share of trading i