Morris, the EU has 41 borders with non EU states. Things go just fine. You seem in shock at the thought that Scotland and England might have a border. Why? If one of the two countries wants to be in the customs Union and single market and the other doesn't, then I guess there would have to be some sort of border. Although of course we've been told that an invisible border in NI is possible
Other border countries deal with it and travelers deal with it without the slightest difficulty. We have got used to not having a border, and we can get used to having one. It wouldn't be the end of the world.
That's my take. Paul Kavanagh has blogged recently on this and I'm pasting some of his article here as it has some food for thought:
Despite the claims of Boris Johnson and others, an independent Scotland would not be forced to join the Schengen Zone, which permits passport free travel between most EU states. Ireland is not a member of the Schengen Zone, instead being a member of the Common Travel Area of the British Isles along with the UK, the Isle of Man, and the Channel Islands. Ireland will continue to be a member of the Common Travel Area following Brexit. So would an independent Scotland. You won’t be asked for your passport at Gretna or Berwick or Carter’s Bar.
The Schengen agreement between EU states was all about removing barriers to travel. It would be a gross perversion of the spirit of the Schengen Treaty to use it to impose barriers to travel where none currently exist. Scotland’s only land border is with England, which means that travel between Scotland and EU states necessarily involves either a flight or a ferry journey, trips which for security reasons demand the production of photographic ID in order to travel. Forcing Scotland to join the Schengen Zone would produce a net gain of zero, while introducing the need for passport checks on Scotland’s only land border. It’s not going to happen, and anyone who suggests that it would is indulging in ridiculous scaremongering.
Since the EU is happy for Ireland to remain a member of the Common Travel Area of the British Isles, it will also extend the same concession to Scotland. However, at some point in the future, should the rUK decide that it wishes to rejoin the EU, then Scotland and Ireland would be in a position to insist that it can only do so if it signs up to the Schengen Accords, which Scotland and Ireland could then also join allowing us passport free travel to everywhere in the British Isles as well as most of Europe. Then Scotland will be able to dictate terms to Westminster. Ha. And indeed. Ha. Ha.
There will be no hard border between Scotland and the rest of the UK following independence. Private travellers will continue to journey unimpeded between Scotland and the rUK. Trade between Scotland and the rUK will continue. Even in the worst case scenario, there would only be electronic checks on commercial vehicles, but even that worst case scenario is vanishingly unlikely. If there is no need for infrastructure on the Irish border, there is no need for any on the Scottish border either. The rUK can’t have it both ways. It just wants people in Scotland to think it can in order to scare, threaten, and intimidate us into voting against independence.
But there’s another consideration here. An independent Scotland will be able to do what Ireland does. When Ireland became independent its trade was overwhelmingly with the rest of the UK. Ireland was impoverished, poor, and its economy was weak. As an independent state and a member of the EU, Ireland has been able to develop its trading ties with other EU states, which has benefited the Irish economy enormously. An independent Scotland would be able to do the same. Independence opens up vast opportunities for Scotland. It would permit the development of direct exports to other countries, exports which currently go through England. Scotland could develop container ports and terminals, and see a massive growth in its direct trade with other nations. And all the while, the border with England will remain open.