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A Labour MP has raised fresh concerns over the government's failure to properly monitor whether migrants leave the UK after their visas expire.
The UK does not record all individuals leaving the country through border checks, relying instead on matching flight, sea, and rail passenger data with visa records.
The government has promised to set out plans to crack down on record-high levels of migration in the next few weeks.
But former Blair-era minister Clive Betts warned the border system "continue to fail" without proper exits checks leaving a risk of people staying illegally and working in "the black economy".