The United Kingdom has the largest population of the two British Isles nations. (UK & Ireland)
No, there is no single leader of the British Isles. What is called the British Isles has a number of countries and they each have their own leaders. The British Isles is a geographical reference, not a political one.
There are only two countries, United Kingdom and Ireland; of the two Ireland has the smallest population.
Ireland (Hibernia) & Scotland (Caledonia).
Great Britain and Scotland are found on the British isles. However, Ireland and England are also found in the British isles.
Geographically, the British Isles are the two main islands of Great Britain and Ireland and all of their off-shore islands. Politically, they are comprised of the United Kingdom and the Republic of Ireland. Neighbouring countries are France, Belgium and Holland.
As a geographical group, the British Isles are comprised of England, Scotland, Wales and Ireland.
There are many river islands in the British Isles but no two comprise them
The British Isles are made up of the 2 large islands of Great Britain, Ireland, and all of the smaller off-shore islands. The countries that the British Isles consist of are England, Scotland, Wales, the Republic of Ireland, and Northern Ireland.
The British Isles consists of the countries of the United Kingdom (England, Scotland, Wales, and Northern Ireland) and the Republic of Ireland.
England is the biggest and strongest.
The British Isles have a milder climate.