British and Irish governments in illegal immigrant crackdown / Times OnlineJuly 24, 2008

http://www.timesonline.co.uk/tol/news/politics/article4390542.ece

"Formal border checks between Northern Ireland and the Republic of Ireland will be introduced to prevent the movement of illegal immigrants to and from Britain, according to proposals published by the two governments today. The proposals would constitute a “substantial change” to the Common Travel Area (CTA) established in 1925."