Great Britain

The majority of British citizens are English. There are as many as 56 million of them or approximately 84% of the kingdom's population.

An excerpt from the article 20 facts about Great Britain

The second largest population is occupied by the Scots (5.4 million) and the Welsh (3.1 million). The smallest part of the population are citizens of Northern Ireland (1.9 million), which is less than 3%.