What's wrong with lots of immigration?

<div>This week's net migration figures were lower than expected, but still far higher than the 'tens of thousands' first promised by David Cameron. What's gone so wrong, and what's the downside of using immigration to boost economic growth? <br> <br> Fraser Nelson speaks to Damian Green, the Conservative MP and former immigration minister, and James Kirkup, a <em>Spectator </em>regular who runs the Social Market Foundation. </div>