Daily Mirror last November,

"The arrival of large numbers of unskilled immigrants has been blamed by politicians on all sides for driving down wages for UK workers."

"Meanwhile, during a speech to right-wing think tank Policy Exchange, Home Secretary Theresa May said: "There is evidence too that immigration puts a downward pressure on wages."

Labour's Ed Miliband has also weighed in: "When millions of workers already have low pay and poor job security in Britain and we add high levels of low-skilled migration, mostly from within the EU, some benefit but some lose out. It isn't prejudiced to believe that."

But a study published in March by the University of Oxford's Migration Observatory argued that the true picture is far more complicated.

Researchers found that overall immigration actually leads to a rise in the average wage of all workers – although increased competition for low-paid or unskilled jobs can lead to wages falling. There can be little doubt that those suffering most are already at the bottom of the wages pile."
http://www.mirror.co.uk/news/ampp3d/does-immigration-lower-our-wages-4670067