大象传媒

David Goodhart, director of the Integration Hub at the Policy Exchange think tank, highlighted the "conflicted obligations" of people in richer parts of the world to migrants.

"We have an obligation to the desperate of the world but we also have an obligation not to unduly disrupt poor and developing countries by tempting people here, one might say," he told the Today programme.

"We don't want to create a wholly unbalanced world in which the most dynamic and best educated people in poor countries find the only way they can have a decent life is by getting themselves into developed European or western countries," said Mr Goodhart.