It is estimated that as many as six million people living in the UK have an Irish - born grandparent ( around 10 % of the UK population ) .
Today , millions of residents of Great Britain are either from the island of Ireland or have Irish ancestry .
It is estimated that as many as six million people living in the Great Britain have an Irish - born grandparent ( around 10 % of the Great Britain population ) .
Today , millions of residents of Great Britain are either from the island of Ireland or have Irish ancestry .