If they had called Barry they would have been told there was another small annual event on.
The airfield is right in the middle of the GU3 area, a very rural agricultural part of Surrey and well away from built up areas.
Unfortunately the new “controlled airspace” allocated to Farnborough means that light aircraft, gliders, and other users of “uncontrolled airspace” will be squeezed closer to the ground - that's where the issues lie hence the odd local house will have to put up with occasional engine noise. I also live locally and we get more noise due to lower light aircraft but that's what you get living close to airfields, it's nothing new.
Farnborough Noise campaign:
https://www.wokingnewsandmail.co.uk/?p=33285