You must report treasure to the local coroner within either:
14 days of first finding it
14 days of realising an item might be treasure, even if you’ve had it for longer
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 get help reporting treasure to your local coroner in Wales by contacting the curators at the Amgueddfa Cymru – National Museum Wales.
National Museum Wales
English: treasure@museumwales.ac.uk
Welsh: trysor@amgueddfacymru.ac.uk
There are different rules for Scotland and different rules for Northern Ireland.