The border for the tunnel is only in France though agreement as originally it was going to be in the UK, so the French are threatening to tear up the current agreement and shift the problem to the UK.
Closing the tunnel is actually a very good suggestion as Eurotunnel is now a 100% owned French company, so do we care if it can no longer operate? Europe also sells more to us than we do to them, so it will be in their interests to make sure trade is not restricted. There are anti-invasion doors that can be used along with flooding it as a built-in safeguard to stop a European invasion of our island. We can go back to all ferry travel, which is much more controllable and this is why they congregate at Calais and not other Channel ports.
The chief culprits for the current African migration are the US, UK and France. Iraq: US and UK, Libya: UK and France and ISIS Obummer's stupid total rapid withdrawal of troops from Iraq, where he has not got a clue on FP, but always knows from his armchair that overruling his Generals on the ground is never going to cause a problem, where: 1) He is always right. 2) If he is wrong see rule 1. He may well go down in history as the first president that has lost 2 wars in quick succession in: Iraq and Afghanistan.
Going further back in time many of the Middle Eastern problems stem from 1918 UK / French arbitrary division of countries in the Middle East between them in the Sykes-Picot agreement. This meant that the two incompatible Islamic groups of the Sunni and Shi'a were not split on ethnic lines and this is still being sorted out in many of the current wars.
