Antique Firearms Regulations 2020
UK Government has published a Statutory Instrument relating to antique firearms. This includes definitions for antique firearms along with an updated obsolete calibre list. This has 23 additional calibres with 7 common calibres removed. We expect this SI to be passed into law before the end of the year.
https://www.legislation.gov.uk/ukdsi/2020/9780348214420