Originally Posted by
Some person
I think I've read somewhere (although I don't remember where) that the location of the Eurostar passport control is determined by some treaty between the UK and France and that it doesn't depend on some part of an EU treaty, regulation or directive, so I'd imagine that Brexit won't change anything.
If a customs control is added, I don't know where it would take place.
This is my understanding of the position. A treaty is required because French agents are stationed on UK soil and vice-versa.