How competent is Scotland’s parliament?

That’s now a question for the Supremes to decide

The UK government is asking the Supreme Court to decide whether two bills passed by the Scottish parliament go beyond its legislative competence. They are

• the United Nations Convention on the Rights of the Child (Incorporation) (Scotland) Bill; and

• the European Charter of Local Self-Government (Incorporation) (Scotland) Bill.

As a devolved assembly, the …