Aero Mad,
One wouldn't get any night freight in/out of Valley because the bl00dy place is closed.
Courier traffic could be a possibility, produce and other stuff to/from IOM and/or NI,wouldn't necessarily have to be in/out of Valley, could position the aircraft to/from somewhere like LPL to fly freight or whatever from/to there ... except that the aircraft is locked-in at a closed Valley airfield and won't be moving anywhere until sometime around breakfast time the next morning or the next Monday morning (public holidays permitting)!