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There are two types of lawful development certificate. A local planning authority can grant a certificate confirming that:
(a) an existing use of land, or some operational development, or some activity being carried out in breach of a planning condition, is lawful for planning purposes
(b) a proposed use of buildings or other land, or some operations proposed to be carried out in, on, over or under land, would be lawful for planning purposes.
I hope this clarifies the position to you.
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