Stu, your link does not support the views expressed here about the benefit to the economy.

"MigrationWatch UK (2014) criticised the assumptions of Dustmann and Frattini (2013). The criticism covers many factors, but overall it suggests that Dustmann and Frattini (2013) exaggerated the revenues the government obtains from migrants and underestimate the cost of public service provision to migrants. Using new multiple assumptions, MigrationWatch UK (2014) finds that during the 1995-2011 period the fiscal impact of EEA migrants was GBP -13.6 billion and the fiscal impact of non-EEA migrants was GBP -135 billion. Looking at the recent EEA migrants, MigrationWatch UK (2014) estimates that the total fiscal impact of recent EEA migrants for the 2001-2011 period was GBP -0.25 billion and the impact of recent non-EEA migrants was GBP -27 billion for the same period."

If there is a net gain but it benefits employers and the wealthy while hurting those at the bottom, is that beneficial?