Some problems with the procedures appearing already.
Well, didn’t see any signs for this on our way into Dover though it was still dark yesterday morning when we arrived. We checked in and through passport control without any hold ups. Only one was that customs wanted to check the car which they did - even loooked under the bonnet/hood strangely.
Maybe they were checking for beef…
Yes, saw that thread, but if we put meat in there it would have been well done by the time we got home. 
UK was a founding member of EFTA but left when it joined the common market in 1973