Alright, so lately I've been contemplating an interesting scenario, and I'm curious as to the plausibility, so, bear with me...
The first major POD will be in 1537, with
Madeleine of Valois, wife of King James V of Scotland, managing to live long enough to give birth to a healthy son in 1538, who we'll call "James, Duke of Rothesay" (ITTL she doesn't contract consumption, but considering her delicate health before, she dies of puerperal fever soon after). As in OTL, in order to secure the Auld Alliance, the king takes another French bride after his wife's death, Mary of Guise.
Second, the Battle of Solway Moss occurs on schedule as in OTL, but this time with an overwhelming Scottish victory, allowing King James V (who does not become ill with fever ITTL) to conclude a favorable peace with his uncle King Henry VIII.
Now, peace temporarily established, the Scots are still threatened in the south by the English, who have just implemented a Reformation. Further, there is a rising protestant movement at home, as well. So, King James V decides to stop heresy in its tracks and protect the Church (both as a loyal Catholic, and also out of patriotism). Thus, he institutes a Scottish Inquisition with Papal encouragement, setting up a Holy Office along the same lines as that in Spain (i.e. under the authority of the Crown).
Is this possible, and what are some of the affects of such a scenario occurring? I imagine it would at least have a great deal of positive impact on the Scottish Crown's struggle to centralize the realm...