In Autumn last year our back door was broken into, whilst we were on holiday, and a number of items taken (our neighbours are aware of this). We had the door repaired (replaced) and installed an alarm system, with a reputable company who charge a hefty monthly fee. The alarm components are supplied, installed and maintained by this company.
Prior to our installation, unbeknownst to us, our party wall neighbour ours also had an alarm system installed by the same company. We have a poor relationship with this neighbour - they have a reputation of trying to throw their weight around.
On the recommendation of the three different alarm companies we spoke to, as well as the Met police officer who took us through the target hardening process, we had a camera installed in the back garden. This only triggers if a persons feet are within our garden, it’s on the opposite side to our party wall neighbours (we are in a terrace) and it does not trigger from the adjoining land.
Said neighbours are now sending us increasingly shirty emails demanding that we take the camera down, telling us that we have no right to record them and that there is no need for us to have a camera in the back garden. It categorically does not record them in their property - the camera is angled such that we could possibly see the top of his head if we were watching at the time he exited his house, but it does not trigger based on this. We can clearly demonstrate that we do indeed need this camera in its current location, as this is where we were broken into. There was also, coincidentally, an issue when we replaced the party fence (a joint instruction) where they trespassed into our property in pursuit of their dog, which they’d failed to put on a lead for the short duration our properties were open to each other.
Other than sending us a cease and desist letter, what can they actually do? They are not reasonable people and I’m reluctant to offer more information than absolutely necessary.