dgerard: >>No, because it includes Northern Ireland :-)<<
Just in case you weren't being funny, FTR. GB is the ISO 3166-1 code for the United Kingdom http://en.wikipedia.org/wiki/ISO_3166-1 and the other chapters are named per ISO 3166.
[Ye, I think UK would have been better too, but it is silly to break the standard for that reason. Apparently the ISO committee guys, who are ironically mostly from a country with the code US (not AM), made the strange decision that it was inappropriate for a county code to be an abbreviation for the generic words `United' and `Kingdom', even though some codes don't even bear any relation to their country's names.]
Joe.