UK Property Law
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The starting point is to check the deeds for both your property and his to determine whether he has permission to use the soak away or an easement. It would be most likely that he does not, although he may claim that he has been using it for so long that this gives him a legal entitlement. If he does not have or claim such a right then you should simply give him notice of what you are doing and that he will have to pay to resolve the issue (with either his own downpipe) or to use yours
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