Judges on the UK Supreme Court will this week deliver their verdict on whether the Scottish Parliament can hold a second independence referendum without prior approval from Westminster.
Nicola Sturgeon instructed the Lord Advocate, Scotland's highest legal officer, to refer the case to the court in London in an attempt to break the constitutional log-jam.
Judges will rule on whether the Scottish Government's independence Bill relates to "reserved matters" - meaning it is outwith Holyrood's competence.
