IIRC, it was pretty recently.

Here it is. Google fu. http://news.bbc.co.uk/2/hi/uk_news/northern_ireland/6966493.stm

This American Life had a piece by Jon Ronson about a man who was tarred and feathered In Northern Ireland in 2007.

http://m.thisamericanlife.org/radio-archives/episode/522/tarred-and-feathered

http://www.thisamericanlife.org/radio-archives/episode/522/transcript