Bulgarian and Romanian immigration - what are the figures?

The number of Romanians and Bulgarians working in the UK has fallen since restrictions were lifted, according to official statistics. So what's going on?

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What has happened?

Airport arrivals sign
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How many more Romanians and Bulgarians have come since 1 January?

Arrivals at Luton Airport on 1 JanuaryPA
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Does this mean fears of a "flood" of immigrants were misplaced?

Romanian and Bulgarian workers
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What does the government say?

Davdi CameronReuters
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And the other parties?

Nigel FarageAFP
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When will we have a better idea of Romanian and Bulgarian immigration trends?