To cut a long story short, not so long ago I had a drone flying around the house, appearing from the east and departing north west. It was in the general area for several minutes, and knowing that they are commonly used by burglars to survey properties. I was quite perturbed by the incident. Then a few days later, another appeared. There is no way of finding where they are launched from, or where they land, or who is using them. A few days later, another appeared, a slightly different shape. I contacted the CCA and they confirmed that under the circumstances I described, they were being flown illegally. But, without being able to trace the user, nothing can be done. The Police noted the incident, but, once again, there's little that they can do.
But believe me, I've considered everything, from a shotgun with No 4 shot to getting a drone myself and ramming them in the air destabilising their gyro system.
Don't tell me that they are not anti-social.
Unless you are prepared to let anyone - including criminals - wander around your house and property at anytime, for any reason, peering through your windows filming you without your consent.