On Wed, 10 Jun 2015 09:24:07 +0100, Tim Streater wrote:

BTW, not too many people are worried about a diverse population. Many
more might be worried about population density, which is driving up
house prices and making it hard to put in new infrastructure.

Using that as an argument in favour of reducing migration ignores
demographics. It ignores the ageing population, the rapidly-increasing
number of pensioners, and the ever-lengthening average lifespan.