Customs controls at the Border with Northern Ireland will return when Britain leaves the EU, a former head of the European Commission's customs procedures has claimed.
Michael Lux said "red and green lanes" could be established as a form of customs control, which would distinguish between vehicles to be stopped occasionally and more frequently.
"So there would be two lanes for vehicles; a green one where you are only occasionally stopped and a red lane if you carry goods above the threshold," Mr Lux told the BBC's 'Inside Business' programme. "Such a system can be established between Northern Ireland and the Republic of Ireland."
Taoiseach Enda Kenny has said he does not see a return of a hard border.
"In principle, there will be Irish and UK customs officials on either side of the Border," Mr Lux said. "But they could agree to create only one stop and officials from both sides deal with the matter or one country allows the other to act on their behalf."
Once Theresa May said she was insisting on immigration controls, rejecting the jurisdiction of the ECJ, and making trade deals with non-European Union countries, a 'hard' Brexit - along the lines of the model in her speech yesterday - became inevitable.