Blackadder who is leaving the Crusaders after eight years as head coach, has signed a three year deal with English club Bath.
Tabai Matson, who has been Blackadder's assistant at the Crusaders, is also joining him at Bath having signed a four year deal with the club.
Blackadder said while he would miss the Crusaders set-up and friendships, there were some things he certainly would not miss.