Lets say the West Lothian Question was resolved either prior or post-WW2, how would OTL Scottish Prime Ministers of the UK (along with OTL Welsh MPs who came the closest to Premiership) have fared instead as First Ministers of Scotland or Wales respectively?
The likes of Ramsey MacDonald, Tony Blair and Gordon Brown come to mind as Scottish Prime Ministers of the UK, while the Welsh MPs who came the closest to power were Nye Bevan, Neil Kinnock, Geoffrey Howe, Michael Heseltine, Michael Howard and John Prescott though am more examples exist for both Scottish and Welsh MPs.
How would Scotland and Wales have fared under their leadership?