A person holding a relevant licence may, without holding a certificate under this Act, have in his possession a slaughtering instrument and ammunition therefor in any slaughterhouse or knacker’s yard in which he is employed.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
For the purposes of subsection (1), a person holds a relevant licence if that person—
The proprietor of a slaughterhouse or knacker’s yard or a person appointed by him to take charge of slaughtering instruments and ammunition therefor for the purpose of storing them in safe custody at that slaughterhouse or knacker’s yard may, without holding a certificate, have in his possession a slaughtering instrument or ammunition therefor for that purpose.
In subsection (1), a “relevant certificate of competence or licence” means—