We are overcrowded.

The UK is already ‘overcrowded’ so a rapid increase in the population due to migration is leading to falling living standards. For example, the UK faces an acute housing shortage, but also an unwillingness to build on increasingly scarce green belt land. In many cities, it is difficult to build more roads because of limited space. Increased population is increasing congestion and urban pollution. Therefore, the increase in real GDP has to be measured against these issues which affect quality of life.