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Hello my name is ***** ***** I will help you with this.
What is it you want to know about this today please?
You can not make the Landlord repair or replace the fence, if the tenant has rented it then it would be down to them.
It would be the tenants contractual obligations to repair if that is what is required.
However that is a matter only between the Landlord and Tenant, not you.
But in any event there is no law whatsoever which says a neighbour must have or indeed repair/replace a fence, unless its stated in your deeds.
This means that the neighbour could remove the fence and there would be nothing you could do.
As such you need to check your deeds to see what it says. But there is no legal obligation to have a fence or make him repair it.
I am sorry if this is not the answer you want, nor the one I want to give you, but I have a duty to be honest.Can I clarify anything for you about this today please?
Sorry its not better news.