Suppose you took everyone in Canada, combined their DNA and did a test for the geographic admixture. Here's what it would look like. The major geographic regions are used by 23andMe which I'll be using in my BIFHSGO conference panel presentation.
Sub-dividing the 2.5 million who self-identified at a finer scale than British Isles, they are about 40% English, 29% Scottish, 28% Irish and 3% Welsh.
For the Ontario Upper Ottawa Valley, the area Statistics Canada calls Pembroke, Irish ancestry accounts for 44%, English 39%, Scottish 16% and Welsh 1%.
Unfortunately neither 23andMe, nor the other companies, sub-divide their admixture results to that fine a degree. Maybe someday we'll see that scale of result, as found in the People of the British Isles project.