43Defence to prosecution for offence under section 42

1. It is a defence to a prosecution for an offence against section 42(1) if the defendant (A) proves—

2. that A took reasonable steps to ascertain whether the person to whom they sold or supplied the pistol or restricted weapon (B) was the holder of a firearms licence bearing an endorsement permitting the person to possess the pistol or restricted weapon by a permit of the kind described in section 42(1)(b); or
3. in the case of a prosecution relating to the sale or supply of a pistol,—
   1. that the pistol was supplied to B for use—
      1. on a range used by a pistol shooting club that holds a certificate of approval issued under section 214; and
      2. under the immediate supervision of another person (C) who holds a firearms licence bearing an endorsement permitting them to have the pistol or a pistol of that kind; and
   2. that, at all times while B was in possession of the pistol, B was—
      1. on a range of the kind described in subparagraph (i)(A); and
      2. under the immediate supervision of C.