When I finally got the results I was rather pleased as they appear to reflect what I have found through traditional research. I have always thought that I am about 67% Irish so I'll take 65% - thanks @AncestryDNA.
As I am an only child I have no siblings with whom I can compare research but I'm lucky enough to have a double first cousin who shares my two sets of grandparents and all my ancestors going back in time.
While the results from my cousin's test and mine are basically the same there are a few minor differences in the amount of Scottish and English estimates but the total of these is very close. My cousin additionally has a 1% Basque estimate, I feel that may be a furphy.
I've posted our results here so that, next year, when Ancestry issue their next round of ethnicity estimates I can easily retrieve what they offered 2021.
What did you discover?