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Planning Policy Guidance (PPG) note 14: Development on Unstable Land

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These two Appendices provide information on causes of instability and other sources of information.
Planning Policy Guidance note 14 was published in 1990 by the then Welsh Office and the then Department of the Environment.
Only the Appendices  to PPG 14 (1990) “Development on Unstable Land” remain in force in Wales.