There is nothing to stop the barbed wire being in situ. You see it on buildings all the time.
However it must be easily visible otherwise, if anyone is injured by it, the neighbour would be liable.
The neighbour is not allowed to create a “trap”.
There is another potential issue for the neighbour that is that as he knows children on next door, he has to be prepared for children to be less observant than adults and hence, if the children are injured by this (bearing in mind that its 2 m high) there is a potential claim in negligence against him.
You have at least a couple of options.
You give him notice that there are children who play here and you tell him that it’s reasonably foreseeable that they will be playing and may get injured by this and that if they do, will be holding him liable in common law negligence and that’s the reason for the notice.
Bearing in mind what I said in the previous paragraph and to pre-empt that, you can apply to court for an injunction to make him remove the barbed wire on the basis that it is dangerous bearing in mind there are children playing in a garden and the garden is the kind of place where children do play. A solicitors letter threatening the court application and solicitors costs may do the trick without the need to go to court.
Can I clarify anything for you?
Please rate the service positive. It’s an important part of the process by which experts get paid.
We can still exchange emails.