Some years ago, I was holidaying in a cottage just off the end of the runway of a disused world war 2 airfield (Dale) in Pembrokeshire. During the night (it was a full moon) we heard an aircraft overhead, and the following morning had a visit from the police asking if we had seen or heard anything. They would not tell us what they suspected, though the word in the village was that it was a drugs drop. We never heard any more.