However, Bev Clarke of the Royal College of Nursing said the system was poorly suited to hospital rotas.

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Earlier this year, he and Clarke began to hear that college and professional athletes were starting to use their drink.

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"I don't mind there being some medievalists around for ornamental purposes, but there is no reason for the state to pay for them, " Mr Clarke told a meeting at University College, Worcester.

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But according to John Salt and James Clarke of the Migration Research Unit of University College London, who have pulled together a lot of the numbers on labour flows, a striking change in the sources of foreign labour is taking place.

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