Home Cctv

My neighbours have CCTV cameras watching the cars on there driveway, but the cameras also pick up the conversations my wife and I have when on our driveway or balcony. Are these cameras legal or is it an invasion of privacy?

Its because of my neighbours I had to purchase this item, and they are fuming as they like to play up, and now my reception has reduced, so was wondering if they also bought wireless cctv can they pick up my camera signals?

The camera will be facing onto the main road outside my home (covering my car), it will not be pointing at any of my neighbours homes or gardens but it will cover a portion of the main street outside my home..will I need permission from my local council?.Thanks.
UK.England..thanks again.