Under the regulations of the FIA (which is what we are talking about) he competed under the flag of the UK.
He's British in this respect.
In the same way that Welshman Elfyn Evans is a British.....
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Britain means the main island (England, Wales, Scotland). But, Cambridge dictionary says of the term ”British”: belonging to or relating to the United Kingdom of Great Britain and Northern Ireland or its people
I feel compelled to comment despite checking this is an M-Sport thread on Motorsport Forums. Under the Good Friday agreement people of Northern Ireland are free to determine their own national identity and can choose citizenship of Republic of Ireland, UK or both. All Brits and Irish have freedom to move, live, work in either state. Kris is at least a British citizen, Aaron Johnston is from the same county and switched competing as a Brit to the ROI a few years ago. Doesn't really matter why, he has the automatic right. To me they are both Irish through coming from the island of Ireland regardless of citizenship.
Maybe Red Bull is M-Sport''s main sponsor now, but not on Greensmith's car as he has his own (familiy businesses' Rockdoor & Gap) who are paying for his drive.