Pre-empt the problem that's like to arise would be my two cent.
The more durable the fence the better, but also the dearer to cost.
For cost savings you could look at a concrete post/timber panel fence also.
You could build a concrete block wall now and suggest that the council finance half of it.
ONQ.
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.