"Non-visible ethnic communities"

I find it hard to keep up with the jargon. Hot on the heels of the Poles, lauded by all as hard-working types, come the Romanians, lauded by ...

1,600 officers in Westminster have been issued with a ten-point guide to the Romanian language so they can communicate more effectively with Eastern Europeans seen acting suspiciously.

"The number of East European immigrants in Great Britain has risen with 25% after the accession of Bulgaria and Romania to the European Union, a survey of the British government points out. According to the study from the beginning of the year, each month in Great Britain arrive 50 thousand citizens of the two new EU-member states. In the first three months of 2006, the number of immigrants in Great Britain from the then eight East European new member-states was 540 thousand people. In the same period of time this year, i.e. after the accession of Bulgaria and Romania, the number has reached 680 thousand people."

In fairness I must point out that the 680,000 mentioned on the Bulgarian news site aren't "immigrants", they're people from Eastern Europe arriving in the UK - mostly in England. They may all be tourists for all we know. As people leaving the UK aren't recorded, we have no way of knowing.
They may all have left, apart from the Demitrie family of Slough.