Dil ireann - Volume 606 - 28 September, 2005 - Written Answers - Official Terms.
The British Isles is not an officially recognised term in any legal or inter-governmental sense. It is without any official status. The Government, including the Department of Foreign Affairs, does not use this term.
as said by Minister Dermot Ahern
Ireland is a country now in its own right. If you'd like to use antiquated terms that is for you to decide but that's the official line on it and indeed the line of its citizens.