The starter of this thread is a gentleman, in every sense of the word. I have known him a long time and is an aircraft nut. Just like many of us. He has his own aircraft and when you see a go-around just in front of you curiosity has to be satisfied. That goes for those who read of it too. It is natural, and has appeared as a question many times. It is nice that 'halo, ' who I know, explains it as the controller who called for the g/a - as did HD did when he was in the tower. It then becomes real to the new breed of spotter/ppl/cpl and on.
I always found that the controllers at LHR and LGW were the best - I don't fly now but I know they still are.
When these spotters hear of these normal instances it means more to them than most, and they 'just have to know' what happens on the FD at that noment and what caused it. 28L gave that view which will, no doubt, tickle the senses of our spotters, just knowing that he is a 747 driver.
Please be patient with them. We were like it once.
PPP