Noisy Engine Running
Beagle, I can assure you we did Belfast engine runs at Abingdon in the early hours which annoyed the residents of Boars Hill, but I remember it as always cold and snowing so you may have missed those. It got to the point where the station PBX put all incoming calls directly through to the aircraft. After all the only calls at that time of night were going to be complaints, and yes there was a telephone on board connected to a point on the pan.
Things lightened up one night when we answerd a call from a sweet old lady who was most concerned at how late we were working and were we warm enough and had enough to eat.
Problem with checks on turboprops is you can't detune the props.