Hey David Bar
I was wondering, with the whole Brexit and Scottish referendum issues now well within our knowledge, if there were any plans to update this alt history with the UK disintegrating. Seeing as how the world following the 2008 recession has revealed just how divided the UK really is, I can only imagine how after losing two world wars and suffering through severe economic depression at the conclusion at the hands of the Germans, I imagine that the cleavaging of the UK would only accelerate in this timeline, with the Scots wanting to secede to form their own state either through referendum, which would have been unlikely at this time, or more possibly open rebellion following in the example of the Irish.
It's important to remember that Scottish nationalism was actually just as strong as Irish nationalism at the beginning of the early-20th century, with many Irish nationalists, like Patrick Pearse and Sean MacDonald, actually visiting Soctland several times to speak to gaelic groups and nationalist parties, most of them socialist as well! Whereas in our timeline, though, where Scottish nationalism never got the same outlet that its Irish counterpart did to grow into a widescale movement, in TTL, with the full success of the Irish Rebellion, the loss in the wars, and the severe economic hardship, it is logical to deduce that there would be more social tension and dysfunction among especially the Scots and the Welsh in the UK. We could even assume that the fascists rose to prominence under the promise to crush the "communist Scottish nationalists "who were "in league with the treacherous Irish" to destroy the UK from within!!! If this were the case, which it would most likely be, the desire to secede would be even more potent upon defeat in the Second Great War and in the economic recession that followed, especially with jailed Scottish nationalists getting their releases.
Food for thought. Might even write the idea myself.