LONDON -- More than two million immigrants will arrive in Britain every 10 years unless strict new controls are introduced, according to an independent think-tank.

Migration watch UK says there are no economic benefits for the country and is calling for "greater urgency and resolution" from the government, according to the British media reports.

The campaign group warns that failing to address the situation "will play into the hands of the far right who seek to exploit the situation for their own ends".

It released the figures ahead of a meeting between home office officials, the immigration advisory service and refugee legal center about plans to fast track the appeal system for asylum seekers.

Migration watch UK net said its figures include net inward migration to the UK in 1999 of 183,000 people.

The figure does not include illegal immigrants, of whom it estimates that 47,000 arrive undetected each year, IRNA quoted, the BBC News On-Line as reporting.

Former diplomat Sir Andrew Green, who established the group with Oxford University academic Dr. David Coleman, said: "Even using very cautious estimates for illegal immigration, we are approaching a quarter of a million migrants a year for the first time in our history.

"That means a population the size of the city of Cambridge being added every six months or a population the size of Birmingham every five years. "On present patterns, two-thirds will settle in London and the southeast.