Ireland shares a land border with Northern Ireland which is part of the UK. That makes Ireland the closest neighbour to the UK.
Ireland is the offical English language name of the southern portion of the island of Ireland as used by the Government of Ireland and not Republic of Ireland or The Irish Republic.
France is closest to Great Britain (England).
Spain
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The nearest continental neighbor to Great Britain is France. The English Channel separates the two countries, with the narrowest point of the channel being about 21 miles wide.
Mozambique.
Argentina is the nearest.
Argentina is the nearest.
Iceland
Wales is part of Great Britain, and the country of England to the east, also part of Great Britain, is its closest neighbor (they have a common border on the order of 200 miles long). The closest neighbor that is not a part of Great Britain is the Republic of Ireland roughly 50 miles away across the Irish Sea to the west.
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Argentina
Wales and Scotland are the countries closest to England England has land borders with both Wales and Scotland, so both are just a step away. At the nearest point, France is 21 miles away.