We're no strangers to it on Boeir, but I came across this article only today. It makes some strange claims, and I have to wonder about the veracity of it, considering the accuracy of the first sentence of the third paragraph.
Are Irish Unionists any less Irish than anyone else?
I mentioned the Protestant-only management till the early 1970's to my father in law and his reply was that was the way business was done in a lot of companies at the time, including a lot of the banks. Doesn't make it right, but it wasn't a Guinness phenomenon.