EXPERTS attacked an anti-EU migration observatory for making “sweeping” predictions yesterday after it claimed that 250,000 people a year would move to Britain over the next 20 years.

According to a report by Migration Watch, if Britain votes to remain in the European Union, “very high levels of net migration” and “widespread complacency and denial about both the likelihood and the impact of rapid population growth” would continue.

But the claims were challenged by the Joint Council for the Welfare of Immigrants (JCWI), which argued that migration was necessary for the recovery of the British economy.