Is the "standard" country code GB or UK ?
According to WikiPedia it depends if you are the EEC or not !
http://en.wikipedia.org/wiki/.gb
.gb is a reserved Internet country code top-level domain (ccTLD) for the United Kingdom. Introduced at the same time as the UK's other top-level domain (.uk), it was never widely used. It is no longer possible to register under this domain.
Starting in 1985, two-letter codes have been used in the domain name system as country code top-level domainsInternet Assigned Numbers Authority assign the ccTLDs, mostly following the ISO 3166-1 alpha-2 codes, but with a few exceptions (e.g., the United Kingdom requested an exceptional reservation of .uk for their ccTLD instead of their native .gb).[1] (ccTLDs). Currently, the
The WIPO coding standard ST.3 uses alpha-2 codes for encoding states, other entities and intergovernmental organizations (and their Patent/Trademark Offices), but includes a number of additional codes. For these additional codes, see the section Codes currently agreed not to use.
NATO country codes are also based on ISO 3166-1 alpha-2.
The European Commission uses ISO 3166-1 alpha-2 with two exceptions: EL (not GR) is used for Greece, and UK (not GB) is used for the United Kingdom.[2]
The United Nations uses a combination of ISO 3166 two- and three- letter codes, along with codes that pre-date ISO 3166, for international vehicle registration codes, the codes on the oval stickers used to identify foreign road vehicles.