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Metal detecting is one of Britain's fastest growing hobbies, and if you're lucky to find treasure, you must report your discovery to the relevant authorities or face potential legal penalties.
Within 14 days of finding it, you must report any treasure to the local coroner. You only need to report items officially defined as treasure. There's an unlimited fine or up to 3 months in prison for not reporting treasure.
You can voluntarily report items to the Portable Antiquities Scheme if they aren't treasure but are still of cultural or historical interest. This is to help keep a record of finds in England and Wales.