FIVE European countries may seek to follow Britain’s lead in leaving the EU in a Brexit domino effect, Germany has warned. France, the Netherlands, Austria, Finland and Hungary could leave. Front National leader Marine Le Pen has pledged to hold a French referendum if she emerges victorious in next year's presidential elections. While for the past two months a Nexit has been on the cards after Dutch voters overwhelmingly rejected a Ukraine-European Union treaty. Angela Merkel's country faces having to pay an extra £2.44billion a year to the annual EU budget once Britain has left.