I am a Buyer with ((deleted--beverage company)) working in Glasgow and after a meeting with a supplier on Wednesday 16th October I happened to glance out of the meeting room window admiring the clear blue sky - most unusual for this part of the world in October. A sudden flash of light in the distance caught my eye and when I got up to look closer out of the window I saw what I assumed to be a large hot air balloon. However as I watched, it seemed to be moving diagonally upwards, very unlike a balloon. As I continued to watch, it continued to move diagonally upwards but at the same time it seemed to be gradually fading, until it just vanished. My colleague saw me staring out the window and asked what I was staring at. I explained to her what I had seen or thought I had seen and just as I was doing so, the object suddenly re-appeared as if out of nowhere only much further to the right than when I had first seen it. Again there was a single flash of light. This time my colleague also saw the object and it acted in exactly the same fashion as previously described. Was it the same object or were there two? I could not say. We are both quite baffled by this. Our offices are under the main flight path to Glasgow airport however we are used to seeing 'planes and helicopters all the time and this was certainly neither. A UFO? Most certainly. Extra-terrestial? Perhaps. There is probably a very good explanation for what we saw but what is it?