No official council statement on beach detecting was found. Search results show a 1995 Eastbourne byelaw for public walks and pleasure grounds that bans metal detectors, but the PDF could not be opened (site blocks automated access) to confirm whether any beach or seafront area is scheduled.
We couldn't find a published rule. Foreshore owned by the Crown Estate follows the Crown Estate's terms; for council-owned beaches, ask the council before you dig.
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