Your common law rights allow you to remove any of your neighbours' branches that cross your boundary without the need to seek your neighbours' permission, although you may wish to notify your neighbour of your intentions. You should not cross the boundary or dispose of the branches or other material from the tree into your neighbours' property, but first ask if they wish to have the material returned to them. If they do not want it, it will be your responsibility to arrange disposal.
If the tree is protected by a tree preservation order or is located within a conservation area you will need to seek permission before undertaking work to living parts of the tree.
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