nuddi,
You do say that you did not hear any helicopters at Bristow Academy, why is that?
I own a house that is 1.4nm from one of the runway thresholds......suffice it to say--if they were flying, I would hear them. There was a time when I would have helicopters fly over constantly....I did not hear one helicopter when I was there two weekends ago, although admittedly I did not go and visit the place. I was there on a Saturday from about 12:00 to 18:30. I have it on good authority from someone who was working at the school in the last year that the place is, and I quote "slow".
As always, do not take my word for it, call them and ask.