This is from dear old multicultural BBC.

"Foreign-born workers appear to have filled about two-thirds of new UK jobs between 2002 and 2006, the report said.

They also may have made it tricky for UK youngsters to get entry level jobs.

And low inflation was achieved by keeping a lid on wage rises.

The ITEM Club estimates 1.5 million immigrants have arrived since 1997.

"Foreign workers come to the UK and obviously help us push up production levels," Professor Peter Spencer, chief economic adviser to the ITEM Club, told the BBC.

"They also help keep the lid on inflation."

However, the report also points out that the growth of immigration may have also increased unemployment among young UK workers. "

Here is the link.
I would not want to be accused of selective quoting.
http://news.bbc.co.uk/1/hi/business/7149258.stm