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Thanks for you question. I am a solicitor in Scotland. It is almost certain that the neighbour will have a heritable right to connect to the septic tank, therefore the first thing you should do is check the title deeds to your property to see if there is a provision to that effect. If there is not then they may still have a right to use the tank if it has been in use by the owners of their property for more than 20 years. Assuming one of those scenarios is the case then you would have to go to the Lands Tribunal to argue that the burden on the title is no longer necessary because they can connect to the public system presumably at virtually no cost on the basis that you have already done so. The tribunal has the power to remove the burden from your title. Happy to discuss further. I hope that helps. Please leave a positive rating so that I am credited for my time.
Here is the link to the Lands Tribunal website. http://www.lands-tribunal-scotland.org.uk/