What if the United Kingdom had disintegrated in 1922 just as the Austro-Hungarian Empire had done in 1918? By this I mean Wales and Scotland gaining their independence just like Southern Ireland did.
Okay, so how does this happen? CP wins WW1 and somehow things go completely to hell? Communist uprising fractures GB and a variety of successor states emerge? The question really begs more details.
I highly doubt it. The United Kingdom, even if it suffered a massive economic crisis, would still be more united than Austria-Hungary. A complete Ireland is totally plausible. Scotland, maybe. But Wales probably ain't gonna be independent. Besides, Britain didn't really suffer as much ethnic problems as the Habsburg monarchy did.