On reflection and having read Geriaviator's contribution I am not sure where the Silver City Bristol Frightener landed in the UK. I seem to remember they called it "Ferryfield".
In 1985 I imported a VW Golf from Berlin. That time the biggest problem with customs was at the German/Dutch border where I had to search for a German customs officer (it was lunchtime) to have a stamp on the car documents proving it had been exported.