Sussex survived much larger numbers of Ugandan Asian refugees and Vietnamese boat people being housed in Maresfield and Tangmere back in the 1970s. I can't see the numbers that are arriving now causing any great problems.
Getting on a ferry, as a regular customer, is going to be a lot more complicated than it ever used to be. This is not going to be great for business. Will it put ferry operators out of business?
Most of the people living in the Jungle haven't even registered with the French authorities. It's the reason the Jungle exists ... the French government doesn't want to acknowledge who these people are or where they have come from. They have simply been permitted to set up camp and squat there...
Once the Jungle is flattened, and Brexit is implemented, what is the logic of retaining a UK border in France? Surely we will have to accept that full border controls will have to be established at the UK channel ports and that people we don't wish to admit will have to be dealt with in places...