Why are we paying immigrants £900 to come to a interview in the UK when we have over 9 million people out of the work force?

http://www.standard.co.uk/news/uk/800000-uk-jobs-advertised-across-europe--and-foreign-jobseekers-even-get-travelling-costs-8734731.html and http://www.ons.gov.uk/ons/rel/lms/labour-market-statistics/june-2015/sty-labour-market-statistics--june-2015.html