Immigration since 1997 has expanded UK GDP by about 3 per cent.
In 2004/5 it contributed about 1 percentage point to the overall growth of 5.3 per cent in this period.
11.6 per cent of 25-34 year olds in the UK have arrived since 1997.
Immigrants from Central and Eastern Europe in 2004 and 2005 have been younger than earlier immigrants and more likely to work in low-skill jobs.
Unless immigrants make disproportionate demands on the welfare system, the structure of taxation means that they are net contributors to the rest of the economy.