Where would Keir Starmer even start in setting up constitutional convention?

Source::
The National
Where would Keir Starmer even start in setting up constitutional convention?

SO Keir Starmer has appointed Gordon “The Vow” Brown to head his constitutional convention in the hope that he can prevent us getting independence. I wonder who will take part as the Tories want to abolish devolution and plan to overrule decisions made in the Welsh and Scottish parliaments.

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The National
Where would Keir Starmer even start in setting up constitutional convention?