By Huw Jones LONDON (Reuters) – Foreign bank branches in the European Union would not automatically become a costlier subsidiary if their business reached a certain “systemic” size, the Czech EU presidency proposed on Thursday. The EU’s executive European Commission surprised foreign banks last October when it proposed tightening oversight of how foreign banks can serve customers in the 27-member bloc. The move follows Britain’s exit from the EU, which has left a competing major global banking centre on its doorstep. “In order to keep the consensus reached on the June compromise text, the Pres…