Admitted to EU in 2007, citizens of Romania and Bulgaria can now work anywhere in the EU.  Certainly there will be strong financial incentives to do so.  A single Romanian or Bulgarian worker in Spain or Italy could increase his or her take home pay by 40-50% by moving to the UK.

For a worker with a spouse and two children the effect would be even stronger. At present they are already roughly three times better off in these countries than in their home countries. If they were to move North that would become a factor of four times in France, five in Germany or The Netherlands and six in the UK.  This is not a question of benefit tourism. It is the effect of working tax credits which, originally intended to lift the low paid out of poverty, are now available to all such workers from the EU.   Can EU Countries Afford the New Migration