Neighbours CCTV recording audio from our back garden

trevormax

Things like RIPA2000, the DPA etc cover government bodies and similar (such as Police, HMRC) and organisations like a bank, shop etc who hold people's personal details. They do not cover privately owned CCTV systems. Further, as has been said, he is not proven to be recording the OP intentionally. He has not set up listening devices with intent to listen to a conversation the OP is having in private.  While the OP's back garden is not a public place, it is also not private enough to be private, since anyone in a neighbouring garden would be able to hear a conversation the OP is having in their back garden. 

As a possible solution however, things like wind chimes are great, but if OP wished to take it to the next level, then you should look in to directional speakers/parabolic speakers/sound projectors. 
These are speakers which can direct sound to a very narrow angle/space, so that it would only be heard if directed at you (kind of like the point of a laser only lighting up the place it is aimed at).
For instance, the speaker would be "aimed" at the neighbours CCTV camera, and any sound played would be picked up by the camera (drowning out any conversation the OP is having), but no other people nearby would hear it. Not the neighbour, or the OP, or other neighbours, or police. 
Neighbour would hear the sound on his camera, but when going outside to his garden, would not hear a thing, thereby making it difficult for him to know where it is coming from.