18   Meters to be tested if owner suspects inaccuracy

(1)  If the owner of a gas meter suspects that the gas meter is inaccurate, the owner must arrange to have the gas meter tested.

(2)  If the gas meter is inaccurate, the owner:

(a)  must notify any relevant interested party in writing that the gas meter is inaccurate, and

(b)  must record particulars of the inaccurate meter and of the date on which the gas meter was found to be inaccurate, and

(c)  must, as soon as practicable, cause the gas meter to be replaced, repaired or adjusted, whichever is appropriate.

(3)  Any record of an inaccurate meter kept under this clause must be retained by the owner for a period of not less than 2 years.