Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
How old are the children
Your ex cannot take the children to Scotland to live without your agreement or an order from the Court.
From what you have said it is unlikely that such a Court Order would be granted.
If the threats have become a major problem then you can seek a Prohibited Steps Order from the court preventing her from changing their schools and taking them to a different legal Jurisdiction (which is what Scotland is)
This is done using a form C100 and paying the fee of £215.
It would be useful to attend Family Mediation first to see what agreements can be reached p but in the event of a real and immediate risk it is not necessary.
I hope that this is of assistance - please ask if you need further details
It can last until the children are 16
If you apply for it she will be part of the process - although to start with you can obtain one without telling her to stop her just going