Any help would be great thanks! 
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This article might be helpful?
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In my experience, make peace fast. Try getting a neutral umpire to fix this. Using a surveyor would be very beneficial and accurate.
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Hi @ABarnes, @RealHelp In my past real estate projects I have always used a surveyor to outline the correct boundary line.
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I have also encountered wrongly placed boundary pegs in many of the residential and industrial projects I and my partners have undertaken - so don’t take a boundary peg as accurate unless you have the surveyor confirm correctness.
Further, for some reason people intentionally or unintentionally move pegs!
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Hello @ABarnes, @RealHelp , @chris-newkids. Be aware that when a developer or builder buys the property next to you they will usually replace or improve the existing fencing. You can get a nasty surprise one day when you come home from work and find your old fence line has moved into your boundary. “It pays to talk to your new neighbour as soon as they start working.
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I forgot to mention. Also, be aware of a builder/developer issuing a fencing notice to you to share costs in erecting a new fence. “This can be a very expensive surprise. 
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Hi @Hopefullone. Thats a really important point. That was my practice when we purchased a new site to build & developed.
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This happen in north Auckland to a new build project next to a car wrecker. It took along time and 3 surveyors plus a lot of legal huff and puff to sort out.
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