Sadly because of enforced freedom of movement throughout Europe ‘migrants’ is what they are albeit of the ecconomic variety, but no borders and no checks allow them to wander freely, though if you ask one of them why they are there it’s not migration but they are refugees, and if they are indeed refugees they should state that at the first safe haven as the UN states.
Illegal immigrants are the concern of all eu member states and not just the U.K. or France, in 2007 Belgium held a month long amnesty for immigrants to come forward and be processed, some had been there long enough to find a steady job, find housing and start families.
The way forward for illegals is to start an eu wide repatriation scheme, and carry out checks,eg if a Romanian truck is found to be carrying them, then it’s down to Romania to place them in an immigration centre and begin the deportation process.
The companies of trucks found carrying them into the port of Calais, Eurotunnel or making their way to the U.K. should have their international permits removed as a prosecution punishment, meaning they can only work domestically.