Official – an island, not a nation or political unit: contains England, Scotland, Wales – all parts of the United Kingdom

“The Kingdom of Great Britain was a state in Western Europe, in existence from 1707 to 1800. It was created by the merging of the Kingdom of Scotland and the Kingdom of England under the Acts of Union 1707 to create a single kingdom encompassing the whole of the island of Great Britain.” (Wikipedia) In 1801 this kingdom was merged with the Kingdom of Ireland (1541-1800) to create the “United Kingdom of Great Britain and Ireland”