We live in a terraced house with a small garden in SE London. A family moved in next door with several young children. The children spend a lot of time in the garden which is no problem at all and we started having the occasional ball come in to the garden which was also no problem for us. We'd just throw the balls back when they came over.
The situation has developed over time. One of the children has SEN and he's developed an obsession with throwing things in to our garden both when we are in the garden and when we aren't. Not just the occasional ball either. Turned from maybe one ball per week in to 15+ items per day such as plastic pieces from toys, rocks, garden tools (rakes etc), trampoline springs, metal poles etc.
We had a new fence put up to the maximum height we were permitted. The parents welcomed this however the situation didn't change at all. The child in question constantly climbs on to the top of the fence & sits there to throw things in to the garden.
We put up some chicken wire on our side of the fence stapled to the fence & some posts on our side giving us an extra 120cm of protection however this has proved useless. He still manages to throw the same kind of items over. This morning he climbed on to the top of the fence, ripped the wire from where it was stapled to the top of the fence on our side and climbed over in to our garden (he had climbed back over by the time I was going out there).
We don't use the garden as we would like to because of this as we can't be out there when he's there, we're also having trouble growing things because they are getting squashed by the debris.
Neighbours on the other side of them have the same problem. Unfortunately this escalated in to a fight on the street between the dads
I don't want to escalate things with the parents because I understand they're up against it but what can we do here?