In section 21 of the Firearms Act 1968 (possession of firearms by persons previously convicted of crime), before subsection (3) there is inserted—
In section 58(2) of that Act (saving for antique firearms), for "Nothing in this Act" there is substituted
Where—
a person is in possession of a firearm or ammunition immediately before the day on which subsection (1) comes into force,
by reason of a sentence imposed before that day, subsection (1) would (but for this subsection) make the person's possession of the firearm or ammunition subject to a prohibition under section 21 of the Firearms Act 1968, and
the person's possession of the firearm or ammunition immediately before that day is authorised by a certificate within the meaning given in section 57(4) of that Act,
the prohibition does not apply while the certificate remains in force.