according to those spoken to at the port of Southampton, 95% of traffic they handle has nothing to do with the EU.. so all they can see is opportunity...
Why would EU traffic go through Southampton when there is a much shorter crossing at Dover or using the Channel Tunnel? Presumably Southampton is where container ships from the Far East arrive so you wouldn't expect it to be affected by Brexit.
A lot of what we produce here in Europe and in much of the developed world aren't bulky goods that needs transporting. For example software and financial services.
I think Switzerland was mentioned by one of the transport operators as an example...
Which is still effectively in the single market despite a recent referendum to restrict EU immigration. The government could have unilaterally taken Switzerland out of the single market in order to end freedom of movement in order to obey the referendum result, but instead went out of its way to meet the EU's requirements as much as they could get away with.