Recollect calibrating the ILS at an RAFG station.
On one of our runs we noted that a group of picnickers had ensconced themselves by the perimeter right under the approach.
For the next approach someone filled a washbasin and, on cue, pulled the plug.
The picnickers clearly put two and two together and got a #1 because, on the next run, they were gone.
What rotters bored RAF crew can be
