Courtesy of intelnews.org:
http://intelligencenews.wordpress.com/2009/10/13/01-273/
Charles Haughey, Ireland’s Taoiseach (head of government) in the late 1970s, and on two instances in the 1980s, used audio surveillance devices supplied by a British security officer to spy on his domestic political opponents.
Of course, the guy making the allegation is hawking a book...
From the Guardian:
Charles Haughey 'used RUC bugs to spy on political opponents'
New book says future taoiseach boasted in 1970s that the gadgets 'changed the course of Irish political history'