The Firearms Regulations 2019 implement in the UK the requirements of EU Directive amending Council Directive 91/477/EEC on control of the acquisition and possession of weapons. They require the notification to a competent authority in the UK of the holding or transfer of deactivated firearms. They come into force on 12th December.
http://www.legislation.gov.uk/uksi/2019/1420/contents/made
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