Thanks so much for the responses! I really appreciate it very much. Its a bit of a nightmare to be honest.
Am seeing a solicitor on Wednesday so hopefully that will help. I'm very eager to see what can be done as I never heard of such a situation before. Its quite frightening to be honest as anyone can come and lay claim to your property by the looks of it and the Police or Gardai can do nothing for you. (Living in Ireland Luternau) I'm dumbfounded by this, as its a civil matter, I can go and knock a path into anyone's garden and you'll have to take the time and money to bring me to court just to stop me.
Salmon, I'm also afraid he's going to try to encroach now that he has demolished the existing ditch and has cleared the area of any former markers.
Have carefully photographed all the area before and after so hopefully that will help.
Anyway, an acquaintance, who is a barrister, recommended to a solicitor who is very knowledgeable apparently in this area so hopefully that will sort him out. Its such a waste of time and money pursuing something that you ordinarily take for granted but in this case it looks as though that's the way its going to be.
Anybody have any ideas whether I should wait and have him put the ditch back in or if I would be wrong to put it back myself?
Have temporarily blocked one site as he removed it with stock in the field leaving them free to roam the country freely, luckily they didn't! Also, if stock did wander out and cause accident, who is liable? I was told by insurance many years ago that if third party causes stock to get out that they are responsible i.e. unlocking a gate etc.