Was there even a drone?
Fuckery a-foot
https://www.dailymail.co.uk/news/article-6524457/Police-continue-quiz-double-glazing-worker-Gatwick-drone.html
Perhaps there is the threat of a stinger missile or missiles in the UK and drones were a cover while counter measures were put in place?
If the threat was revealed it would cause two things. Panic of normies and compromise of Intel source.