Will emergency brake in EU deal curb migration?

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Cutting benefits to migrants in the UK is not likely to lead to a "dramatic reduction in the numbers of people coming here" says a migration expert. Madeleine Sumption, the director of the Oxford University Migration Observatory speaks to Edward Stourton on the World at One. A proposal in the draft plan for a new UK EU deal would include an emergency brake on in-work benefits for EU migrants in the UK.