Which is why of course I wrote English as 'English' Pete.
There's more to it than that as well Al.
There is no guarantee that Scotland would apply for EU membership. If Scotland becomes independent she would obtain 'new nation' status, from there she would have to apply, should she want menbership, to the EU, NATO, IMF, UN International Criminal Court, the Commonwealth, Interpol, negoiate trade agreements etc and open embassies in those countries that recognised her.
All that plus issuing her own stamps, passports, driver's licenses, TV licences etc etc etc plus setting up the necessary infrastructure to support all this.
If she didn't join the EU then controls of some kind, unless otherwise negotiated, would have to be set up at the border.
Roy.