Hi, welcome to the site. My name is Max and I will help you with your question.
Are you the owner of the fence, or obliged to maintain it please?
it was there when i moved in, i repaired it ,its like new,then the tenants moved in and started pilling against it and pushing it inwards
And it pushes in towards your land and into your land?
yes,and some of the bricks that are forced through the gaps,fall down on to were we walk,this up to a 15ft drop,and the stones are up to 20 kilos,
That sounds like it could be dangerous too?
very! i am not exadgerating
In this case, I think you have various different types of claim you could bring to stop them doing what they're doing.
i know its wrong what they are doing,but am unsure how to go about this
1. complain that they're trespassing into your land/airspace;
2. bringing about a dangerous situation with the risk of injury and are under a duty to abate that risk;
3. causing physical damage to your fence (I appreciate you're not sure whether it technically is your fence).
You should write to them, mention all three (without the qualification on (3)!), and tell them that they must make good, otherwise you would consider issuing court proceedings for an injunction to force them to take these steps and make it safe, and prevent further trespass and/or nuisance to you.
how would i stand calling in the hse
You could do a solicitor's letter, yes, they are often taken notice of more readily.
You can call in the HSE too, and the local council if they're council tenants perhaps, or their own landlord if private tenants.
Do you want me to help with anything else?
thats all for now thankyou for your time,i will look in to some of your suggestions max,
Thank you. Would you rate the answer as highly as you can for me please.