The United Kingdom of Great Britain and Northern Ireland – the current formal name of the United Kingdom.
England (the land of Angles tribes initially) – the historical land and the administrative unit of the UK, or a part of Great Britain.
Great Britain – the consistent part of the United Kingdom along with Northern Ireland, which unites England, Wales and Scotland. It is also the name of the isle, where all these three parts are situated. The first mentioning of Great Britain dates back to the 1603, when King James I of England ruled the country.
The United Kingdom – the common name of the country.
The United Kingdom of Great Britain and Ireland – the name of the country since the Republic of Ireland was included (1801).