activate Operation Stack on the coastbound carriageway of the M20 early on Monday – leaving freight lorries queueing for miles.Industry experts have also warned it could cause potential serious disruption to the country's Christmas fresh food supply.But French transport minister Jean-Baptiste Djebbari said on Monday that a protocol would be adopted at a European Union-wide level "to ensure that movement from the UK can resume".The UK has been cut off from large parts of Europe - and some other areas of the world - as authorities imposed bans on passengers because of concern about the more infectious mutant coronavirus.The most dramatic intervention came from France, which put in place a ban on hauliers crossing the English Channel with.