Although this doesn't cover Calais specifically it does break down the numbers a bit.
[Link]
62%

Far from being propelled by economic migrants, this crisis is mostly about refugees. The assumption by the likes of Hammond, May and others is that the majority of those trying to reach Europe are fleeing poverty, which is not considered by the international community as a good enough reason to move to another country. Whereas in fact, by the end of July, 62% of those who had reached Europe by boat this year were from Syria, Eritrea and Afghanistan, according to figures compiled by the UN. These are countries torn apart by war, dictatorial oppression, and religious extremism – and, in Syria’s case, all three. Their citizens almost always have the legal right to refuge in Europe. And if you add to the mix those coming from Darfur, Iraq, Somalia, and some parts of Nigeria – then the total proportion of migrants likely to qualify for asylum rises to well over 70%.

The Right Wing signed us up to Maastricht and freedom of movement for foreign workers. The Right Wing joined the EU in its original form. The right wing encouraged economic liberalism and were anti-protectionism.

Most of what we have now that you don't like is the result of right wing government's implemented free market policies which were not reversed or regulated during Labour's tenure 1997-2010.

The Right Wing by 2020 will have been in charge for 28 of the last 41 years.

But let's blame the left anyway.

Whether we are 'in' or 'out', the bottom line is that nothing will really change.
Be-it a General Election or a vote on Europe, life will carry on with little disruption (if any) for 99% of us, the same as it always has and always will be.

Fact.