Anti-social behaviour

[Mahari]

I have a new neighbour who is causing a lot of problems.
Because of safety and security issues I have contacted a fencing contractor to erect a fence as the HA was not interested in the problems caused by the new tenant. This tenant has now attached items to the fencing posts and refuses to remove them. My understanding is, when you own a fence, regardless whether you are a social housing tenant or property owner, the fence is yours and nobody can paint/varnish or attach things without your permission and doing anything to the fence without permission from the owner, is criminal damage.
The HA is less than useless and I had no luck with getting reliable information from Citizens Advice Bureau and legal advice is too expensive.
The HA are washing their hands of all the problems that caused the necessity of erecting a fence in the first place.
I just want to know where I stand legally.

If you're talking about their side of their garden which I assume you are, I don't know the ins and out but most people paint their side that I know of.

All though annoying for you if you paid for it, I wouldn't let it get to you.

Thank you
If the neighbour was pleasant I might not be so annoyed but, if the drilling into the posts causes any damage it will be my responsibility to get it repaired/replaced.
The neighbour even had the gall to claim that the police had sited the equipment for security reasons and it turned out that the police knew nothing about it.
Verisimilitude is the neighbours MO.

Very odd of them to make up nonsense about the police. It makes them sound ridiculous.

To be honest OP if there isn't actually any damage to whatever they've put on/in the fence and it is on their side not encroaching on the property I cannot possibly imagine it's worth the grief, mental load or financial expense of bothering with it even if it is the case that you own the fence. Not excusing their rudeness of course but these things are a pain and neighbourly disputes are awful to endure.

We recently bought a property which overlooks a toddler play park - it's very small with some grass in it but mostly toddler play stuff. It is in the middle of 8 houses so 4 and 4 with a park in the middle. There is a road that separate the park and house and driveways. Kids - about 10-15 each night are playing football around the toddler play park and ruining the grass. Worst thing is they're sooooo loud until 10-11 pm screaming and shouting and swearing. They also keep kicking the ball into our front garden, hitting our house and our car and it's caused damage to a visitors car. I have contacted the local counsellor who said it's not within her jurisdiction. I contacted the council who said given its private land (we pay factor fees) it's out with their jurisdiction and I contacted the factor who said they would need a vote for a no ball games sign but it's not enforceable and only affects 8-10 houses out of 242. There are three huge play fields down the hill and a football cage - when I tell the kids to keep off the drive/watch the car they swear back etc. What can I do?