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You should write to your neighbour and inform them about the damage being caused to your property and ask them to rectify their drainage. You may also complain about this to the environmental health section of your local authority as this may also be nuisance and they have the power to issue an abatement notice to your neighbour.
If your neighbour or council does not do anything, you may then go to your local magistrates court for an abatement order and make a claim for damages in the civil courts.
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