From the BBC Scotland news...
The current restrictions mean that people should not travel between Scotland and England, Northern Ireland, Ireland or Wales unless it is essential.
People living in level three and level four area should not travel abroad for non-essential reasons, including for holidays.
Those in levels one and two have been strongly advised not to travel overseas by the government unless it is essential.
But it is still legal for them to go on holiday, and they are allowed to travel to airports, railway stations and ferry terminals in level three and four areas in order to do so.
I think this simply outlines the confusion that surrounds travel advice / rules.