Here is some more evidence to throw on the growing pile that shows that immigrants to the UK make a net contribution to the UK economy. http://www.bbc.co.uk/news/uk-24813467
And here is a link to the authors’ own article on a website called The Conversation: http://theconversation.com/revealed-immigrants-put-34-more-into-public-finances-than-they-take-out-19845
This goes some way to busting some immigrant-bashing myths.