Sorry DaveReidUK, my mistake, I thought it was posted here. I saw a posting by a YYZ controller on another (private) forum where he stated that it's been investigated internally and he said that the controller used the full call sign. I observed at one of NavCan's internal investigations several years ago and that's where I learned that the live ATC sites often clip the beginning of a transmission. When I listened to the recordings of this event, I clearly heard something being clipped at the start of his calls - not only the calls for the go-around but also 3 minutes earlier when he issued the landing clearance.