I have had 4 different estimates, since first test results in April 18 - then it was 88% Ireland/Scotland/Wales, the other 12 % being east Europe/West Europe/GB/Scandinavia/Finland & Russia & South Asian (<1%).
In May 2019 I was 100% Ireland Scotland.
My next upgrade (don't have the date to hand) I was 96% Irish/Scottish the other 4 being variations on the same theme, Northern Ireland/ Western Scotland, etc., including ?? Cumbria.
Finally today I am 79 % Irish, 21% Scottish, with the areas involved being the same as before, Connacht (Galway/Connemara), Donegal (esp. Inishowen), Northern Ireland/ Southwest Scotland and Western Scotland etc, with the inclusion of Brittany somewhere there too. However, they all indicate what is true, as far as we are aware, we are of very nearly 100% Irish origin, though in Scotland in some cases for 200 years, and much of the origin in Ireland being from places in the north, from which people travelled back and forth to the south and west of Scotland for a millennium. So it is likely impossible to distinguish between the people in these areas of Ireland & Scotland, anyway.
So for me, the different ethnicity estimates have always been pretty close to what we thought, basically Irish with a wee bit of 'Scottish incomers' to Ireland in the north, probably, and then everyone transferring over to Scotland, just to confuse things a wee bit more! However how accurate they are for everyone else, well thats for everyone else to say.