Rush for dual-nationality passports as EU migrants fear Brexit. From work permits to healthcare, pensions to tax, EU citizens in UK and Britons in Europe worry they could be in a precarious position after 2016’s referendum.erman national Stephanie Zihms expects to take the Life in the UK test soon. In fact, the practical consequences of a Brexit for the approximately 2.4 million EU citizens in Britain and nearly 2 million Britons estimated to be living on the continent are not yet clear.