Originally Posted by
SWBKCB
Isn't it covered by the UK bit? GBNi would be a appropriate contraction.
This is correct.
UK is the United Kingdom of Great Britain and Northern Ireland.
GBNI is also the correct abbreviation (and is used as the reg on one of the Titan A321s used by the Government).
UKNI
is a new conformity marking for products placed on the market in Northern Ireland which have undergone mandatory third-party conformity assessment by a body based in the UK. https://www.gov.uk/guidance/using-the-ukni-marking
but UKNI is not a recognised way of abbreviating the country.