UK Property Law
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If the flue projects over your land (whether it is 5 or 6 inches does not matter - it could be 1 inch), the key question is whether the flue is original or a later alteration. If it was a later alteration it is a trespass and you would be able to force your neighbour to remove it by taking legal action. If it is original then it is likely to have a right to remain there. Section 2(2)(g) of the Party Wall Act gives you the right to cut away anything that projects over your land; including flues. I would write to them and put them on notice that this is trespass. I hope that this helps. Please rate positive. Thanks
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