Whiskey1,
I think you may need to appoint professionals to assist you who are experienced in matters such as you describe.
The "stoning" of the right of way already carried out may need permission, which could be a big stick for you to wield.
There may be a planning requirement for the new road, in that I don't see roads being built over farming land as a matter of course.
You may need to take professional advice from a competent architect or planning consultant in relation to the exempted development schedule.
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You may also need other professionals acting for you
Solicitors are competent to advise on the right of way.
Engineers are competent to advise on the construction of roads.
You could be unwise think that your neighbours professionals will act even-handedly towards you.
At the least you will need to ensure that your neighbour's solicitor does not take a legal action to claim more rights than he already has.
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A permanent new roadway (which is where this seems to be going) may affect drainage or services through the land to the detriment of your property or adjoining properties.
Roadworks exert a pressure on the subsoil which can cause local flooding.
There may be wildlife habitat issues which you may or may not be required to support.
You need to ensure that as a result of these operations you, as the landowner, are not liable for the costs of installation or upkeep or additional insurance relating to the new road.
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You will also need to take specific advice in relation to the implications of the Land Conveyancing Law Reform Act and the registration of Rights of Way.
This may be what has prompted your neighbour's R.O.W. actions, because a section in this Act effectively extinguishes all unregistered Rights of Way unless they are Registered by next year.
This post may be relevant
http://www.askaboutmoney.com/showpost.php?p=1188841&postcount=6
This thread is the context
http://www.askaboutmoney.com/showthread.php?p=1188841#post1188841
ONQ.
[broken link removed]
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.