Certainly wasn’t caused by wx, or ATC. It has been CAVOK all day with a westerly wind of 5kts. I saw this a/c make its missed approach - just a flight along the Final Approach Track at 2000 ft. followed by a left turn of approx. 270 degrees onto North, & disappeared into the distance. Shortly afterwards an ATR joined on a right base & landed on 26? I have absolutely no idea as to the reason for this - must have been something important !?