I don't get it. The local rules do not need to change. The UK would have made rules governing itself locally. Those rules should still be the same. The only thing I see with the brexit is now there is a border change. This "should" only affect people visiting from other countries. However, brexit "should not" affect UK citizens, unless they are traveling remotely. All the UK needs to do is pass an agreement that the border stays the same as it is now, until they can agree on how to limit it.