(1)  The Director may, on application by a licensee or gas supplier, approve in writing an alteration to the prescribed characteristics (including the odour) of the gas supplied by the licensee or gas supplier.

(2)  The Director must not approve the alteration unless satisfied that –

(a) the licensee or gas supplier has undertaken, at the licensee’s or gas supplier’s own expense, the modification or replacement, as the case requires, of any gas installation that may be affected by the alteration; and

(b) the gas installation as so modified or replaced will comply with the Act.