So what's the best way to down a drone?
Here in the UK, the firearm option is unavailable*, so what are the alternatives, and how legal are they?
An earlier commentard suggested a pressure hose, which sounds like fun, though I expect the range is a bit limited, and you would probably get complaints from anybody who was underneath.
Someone else suggested a defence drone that could drop stuff into the intruder's rotors.
What about electronic counter-measures? I assume traffic to and from the drone is encrypted to prevent hijacking, but would it be possible to disrupt it in some way? The attraction of this is that it would be much harder to trace the drone's "accident" back to you.
* Given the amount of willy-waving associated with firearms, I'm not sorry, though I anticipate a shoal of downvotes for saying so.