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Yet even if one agrees that a country has a right to restrict immigration, it does not follow that it ought to do so. Mr Legrain argues that it is not just in the global interest to have free migration, but also in that of recipient countries. A standard “gains from trade” analysis would suggest that this should be true. But if one is to argue for free movement of labour on economic grounds one needs a sense of the likely consequences. Analyses of free migration in the presence of huge real wage differentials suggest that we would end up with vast informal sectors and shanty towns. That is what happens within poor countries. Why should it not happen across the globe? I cannot see how one would persuade a host population that this outcome would be in their interests.

But the same powers will also be handed to the tax authorities, 475 local councils, and a host of other organisations, including the Food Standards Agency, the Department of Health, the Immigration Service, the Gaming Board and the Charity Commission. The initiative, formulated in the wake of the Madrid and London terrorist attacks of 2004 and 2005, was put forward as a vital tool in the fight against terrorism. However, civil liberties campaigners say the new powers amount to a 'free for all' for the State snooping on its citizens.

The new measures were implemented after the Home Secretary signed a 'statutory instrument' on July 26. The process allows the Government to alter laws without a full act of Parliament.