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The United Kingdom ("UK") is a country spread over several islands off the coast of Continental Europe, the largest of those islands being "Great Britain". The term "United Kingdom"has covered different areas over recent centuries. Since 1949 or maybe earlier in the 20th century, it has covered England, Northern Ireland, Scotland and Wales. See the individual pages for details of researchers and volunteers. Northern Ireland may be included in the Ireland page, which covers the whole of that island.

Some associated British islands are not part of the United Kingdom. The main ones are the Isle of Man in the Irish Sea and the Channel Islands near Normandy.