There was no separate King of Scotland in 1942. Scotland ceased to have its own distinct monarch in 1707 with the Acts of Union, which created the Kingdom of Great Britain. Since 1603, the crowns of England and Scotland had been in personal union (James VI & I).
In 1942, the sovereign was King George VI (reigned 1936–1952), King of the United Kingdom of Great Britain and Northern Ireland. His Scottish connections included residence at Balmoral Castle and the title "Lord of the Isles," but he reigned as a British monarch, not a King of Scots.
The last monarch crowned specifically as King of Scots was Charles II in 1651 at Scone.