We used to stay at a caravan site on the edge of Mildenhall for the airshow each year. Prolonged Herc ground runs are a hateful, unpleasant, soul destroying experience if you're trying to get some sleep. They just drone on and on and on and on and on and on and on with a semi-random edge to them that means you can't tune them out.
VC10s are noisy but scream off and away and that's it.
Also, as I recall Lyneham is pretty much surrounded by earth banking, base housing, trees etc. Brize is a much more open vista so the noise is going to travel a lot more easily.
Needless to say only an amoeba could not have foreseen this problem, but then amoebas seem to have been put in charge of the whole Brize move.