Why do we compete as Great Britain and Northern Ireland at the Olympics and not as the UK?
Basically, its historical that we enter as GBR..
http://www.bbc.co.uk/blogs/rogermosey/2009/09/why_team_gb.html1111But the key points are that we've entered the Olympics as Great Britain since the modern era began in 1896 and the recognised international abbreviation is "GBR".