England, Wales, Scotland or Northern Ireland?

1.8 million (versus 3.1 million for Wales, 5.4 million for Scotland and 55.6 million for England).

77 years for men and 81 years for women. https://bit.ly/2xN0GzS

Welsh is the only de jure official language in any part of the UK.

One (versus fourteen for England, eight for Scotland and three for Northern Ireland).

39.89% (versus 19.19% for England, 8.37% for Scotland and 16.95% for Wales). https://en.wikipedia.org/wiki/Demography_of_the_United_Kingdom#National_identity

406.55/km2 (versus 67.22 for Scotland, 147.43 for Wales and 130.81 for Northern Ireland).

3% (versus 8% for England,15.9% for Scotland and 45% for Northern Ireland).

The Cornish language now has around 500 speakers. Welsh, Irish, Ulster Scots and Scottish Gaelic have never been extinct.

The UK's two Irish Prime Ministers, William Petty and Arthur Wellesley, came from Dublin and lived before the existence of a separate Northern Ireland/Northern Irish identity. David Lloyd George, despite being born in England, was a native Welsh speaker and identified accordingly.

"Dieu et mon droit" (God and my right).

The Caledonia colony/Darien scheme lasted from 1698 to 1700 and almost bankrupted Scotland.

According to this quiz: https://www.jetpunk.com/quizzes/parts-of-the-united-kingdom