The newest translations are "First Person Sorrowful" published by Bloodaxe Books in Britain.

  "First Person Sorrowful" was published in Britain last month when it was presented to Aldeburgh Poetry Festival in November. In time with the publication, Ko and Brother Anthony of Taize, professor emeritus of Sogang University, who translated Ko's work along with Lee Sang-wha, attended the festival from Nov. 2 to 4. The readings of his poems received the interest from the participants. 

Source: http://www.koreatimes.co.kr/www/news/culture/2012/12/142_126090.html