I wonder if one of our UK based boomers could enlighten us as to where the activity in BM1 and BM2 is taking place. Is BM Castle/ willow creek in England or Scotland? I was thinking Scotland, just because of the name "Gordon". Yet the characters in Willow Creek seem to have Irish accents, and some sound like Yorkshire men. and Samuel seems to have a very (veddy) upper class English accent. Any thoughts?
A fictional town in England

There is also a castle in Wales in Black Mirror 2 and a character from that castle with authentic welsh voice acting.
Yes, the name gordon is generally thought of as scottish origin, however I found a little info on it:
"Gordon Surname Origin
(Origin Scottish) Gurtduine, Gaelic, a fierce man; Gwrddyn, Welsh, a strong man; Cawrdyn, Welsh, a hero, a giant. Some have derived the Gordons from Gordinia, in Thessaly; others say they are descendants of the Gorduni mentioned by Cæsar in his Commentaries. The name appears to be local, and may be derived from a town in France of that name, in the Department of Lot. It signifies in Gaelic the round hill, or the hill that surrounds, from Gour, round, and dun, a hill or fort. "