The figure for workers from the previous wave of EU enlargement, the A8 countries, stood at 861,000, up 26 per cent on 2013.
Migration Watch UK chairman Sir Andrew Green described this as "the sharpest increase in A8 migration since the boom year of 2007, despite measures to restrict benefits".
He added: "A 13,000 increase in the number of Romanian and Bulgarian workers is significant, especially as transitional controls were still in place for the first half of the year."
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