If its the advert that says "100% pure new zealand" then it was a song made specifically for the advert. Its by a bloke called called Dave Dobyn. He's done loads of songs but none like the one they used in the ad. Thats from sources on the inside as well. Who knows they may release it at some point.
cheers Orient FC .... somebody already gave that name and like you say the song aint been released yet ... hence cant seem to get a copy....... but many thanx anyhows m8y