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Here is a linguistic map of Scotland from the year 1400. As you can see, the Scandinavian language, Norn, was spoken in Orkney, Sheltand, and Caithness. Norn would linger on until the 18th century.
The ATL in this scenario is that Norn manages to survive intact at 'commoner level' until at least 1914 and that Gaelic manages to keep its whole 1800 territory intact at commoner level until at least 1914 also. Question, how does this effect Scotland?
Btw, I see this as perfectly feasible given that the regional languages of France managed to survive largely intact among the peasants until the 20th century, and even more can be said for Spain.