GIGO.
Most of us are mongrels. Most of us cannot take EVERY SINGLE line beyond civil registration. Most of us have few unique surnames in our trees. Most Ancestry trees have a few flaws in them. Most parish registers have the odd hiatus. Sometimes my ancestors laugh at my across a generation's divide, knowing that no records survive to prove the connection. But often they have just arrived in the interim.
Given all those factors, I don't have any faith in the current ethnicity estimates, and suspect it will require a good many more updates before they produce anything remotely convincing.
If I look at my "Scottish" ethnicity it is currently 17%.
No trace of a Scottish Ancestor so far, but when I drill down, the range is 0 - 30%.
I'd only trust an ethnicity where the bottom figure is at least above zero.
This, by the way, is my 2020 estimate:
Ireland & Scotland 5% (Range: 0%—8%)
Norway 3% (Range: 0%—8%)
Now, the Norweigan is Welsh. A few years back, it was French.
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The chestnuts cast their flambeaux
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