UK Property Law
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The seller will want this issue to be resolve pre-sale because the LA will need to give their permission to rectify this defect - it is normally straight forward and would be easily rectified at the time of exchange or completion as long as they provide consent in writing. It is not necessarily something which would stop the sale - it is easy to resolve (with their consent) for the conveyancing solicitor. Happy to discuss - please rate positive.
I hope this helps. Please rate positive