Maybe we need a table like this. Maybe it would help the ill-feeling and improve the article? With a link near to the article top? 

 Etymology and terminology: Summary 

 The United Kingdom Of Great Britain and Northern Ireland: is the full name for the UK. Its name reflects the union of the island of Great Britain with Northern Ireland. 

 United Kingdom and UK: is a standard name and abbreviation for the UK. 

 GB and GBR: are the ISO 3166 codes for the UK, used by e.g. the International Olympic Committee (IOC), UK passports, and the UK licence plate country code.[1] GB is occasionally used as an abbreviation for the island of Great Britain [4]  

 Britain: is an name for the UK, which is also used for the island of Great Britain, so it is ambiguous.[2] 

 Great Britain: is name for the UK, whose use is discouraged as it can easily be confused with the island of Great Britain.[3]  

 [1] See e.g. http://en.wikipedia.org/wiki/European_Olympic_Committees  
 http://en.wikipedia.org/wiki/Uk_passport  
 http://en.wikipedia.org/wiki/Team_GB 
 http://en.wikipedia.org/wiki/List_of_international_vehicle_registration_codes  

 [2] See http://en.wikipedia.org/wiki/Britain   

 [3] See e.g. http://en.wikipedia.org/wiki/Great_Britain_Davis_Cup_team  
 http://en.wikipedia.org/wiki/Great_Britain_national_rugby_league_team  

 [4] See e.g. http://www.gbboxing.org.uk/page-how-can-i-become-a-gb-boxer.php