^^
Well I'll run with this, because it's interesting.
I can talk of the Irish/Catholic experience in Scotland, which was one of being limited to unskilled agricultural work or mining. Discrimination was found even in the labour and trade union movement in particular into the second half of the 20th century.
My grandfather took his apprenticeship in 1932 but could only find work in the Jewish garment industry.
Various violent proto-fascist 'Protestant Action' outfits did well in local elections in Scotland (31% in Edinburgh as late as 1936) in part answering the 'call' put out formally by the Church of Scotland in 1930 to repatriate the Irish and opposition to The Catholic Education Act.
Indeed the 'legit' fascist outfit that organised in Scotland, that came from Mosley's 'New Party' wasn't initially Mosley's BUF, because the BUF wasn't anti-Catholic (and arguably had quite a healthy Catholic membership) and it folded because it wasn't anti-Catholic enough. Political fascism; the fascism of Mussolini and Hitler was feared to be effectively 'Popish'.
What's problematic is that some significant officials (and possibly voter base, but it is hard to analyse) of these Protestant outfits were Jewish. Possibly to get a foothold in municipal politics. From my own and others understanding of the Jewish experience in Glasgow (I live in a formerly heavily Jewish area) anti-Semitism of the political side (though not the social) was mild, because anti-Catholicism was a distraction.
I'm reminded of the joke in Derry Girls where they ask the Protestant RUC officer how many Catholics are on the force and he says that there are three, if they include one Jew in a town some miles away. Something about the Celtic nations' attitude towards Jews has always struck me as unusually opportunistic--intensely antisemitic when it suits, relatively non-antisemitic when it suits, seeing Jews as part of the sectarian "us" when it suits, seeing Jews as part of the sectarian "them" when it suits. Would you say there's something to that?
If I had to guess, this type of opportunism is probably really common in nations where the Jewish community is very small and is forced into the "middleman minority" stereotype as mentioned above.
