5In section 9 (certificates of completion)—
(a)in subsection (2), for the words " but only if, they are satisfied that" there shall be substituted the words " , so far as they are able to ascertain after taking all reasonable steps in that behalf, ";
(b)in subsection (3), for the words, " be satisfied as mentioned in the last foregoing subsection " there shall be substituted the words " grant a certificate of completion ";
(c)after subsection (3) there shall be inserted the following subsection—
“(3A)In respect of so much of a building as consists of such an installation as may be prescribed, not being an electrical installation, a buildings authority shall not grant a certificate of completion unless there is produced to them a certificate granted by a person of such class as may be prescribed certifying that the installation complies with such of the said conditions as relate to it:
Provided that this subsection shall not apply in a case where it is shown to the satisfaction of the buildings authority that for some reasonable cause such a certificate cannot be produced.”;
(d)in subsection (4) for the words " the last foregoing subsection " there shall be substituted the words " subsection (3) or (3A) above ".