"Its employees are predominantly from Northern Ireland (so not British)"
I'm afraid if you said that in parts of Northern Ireland you'd find yourself kneecapped by the majority who regard themselves British
"The Northern Irish are British, both politically and geographically. Politically, because they are citizens of the United Kingdom of Great Britain and Northern Ireland, for whom the generalised ethnonym is British.Jun 25, 2018"
I suggest you (do not) visit there
What on earth do you think a century of conflict has been about ?

The International nature of business has long removed the antiquated view you seem to hold
Jim Carroll