I don't know if this is related to what happened at Gatwick Airport, but I recently found someone's interesting analysis of drone incidents around airports worldwide. Especially since it mentions the subject of drone swarms, and apparently Gatwick was about multiple drones (?)
https://bayourenaissanceman.blogspot.com/2018/12/drone-collisions-what-did-i-tell-you.html
From article:
Quite apart from terrorists using small unmanned aerial vehicles (UAV's, or drones) to carry explosives or other weaponized cargo, I've been warning for years that they may be used to try to deliberately collide with airliners while landing or taking off. The sheer volume of such incidents (most, thanks be to God, near-misses or close encounters so far) convinces me, from a statistical perspective alone, that all of them can't possibly be accidental or unplanned.
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I continue to believe that deliberate attempts to crash a drone into a jet airliner have occurred, are occurring, and will continue to occur. If the Aeromexico incident is included, there have already been at least four recorded incidents of drone mid-air collisions of which I'm aware, including one in Canada and one in New York. I can easily imagine terrorists planning to fly multiple drones into the landing pattern of a major airport, to "swarm" an airliner as it was too low and slow to maneuver easily. That's not a happy thought - and the damage shown above illustrates the danger. What if that drone had hit an engine, or multiple engines, rather than the nose cone? What if it had struck the cockpit windows instead of the radome?
Food for thought.