28.—(1) The GB competent authority may recognise different reference temperatures from those set out in—
(a)paragraphs (5)(b) and (c) of packing instruction P200 of Section 4.1.4; or
(b)Sub-sections 4.2.2.7.2, 4.3.3.2.2 or 4.3.3.2.3,
in relation to the filling of pressure receptacles and tanks intended to be used only for the national carriage of liquefied gas.
(2) The GB competent authority may recognise standards for the construction of the shell of a tank intended to be used only for the national carriage of liquefied gas which specify—
(a)a different design reference temperature for the shell of the tank from that set out in Sub-section 6.7.3.2.1; or
(b)a different test pressure for the shell of the tank from that set out in Sub-sections 4.3.3.2.2 and 4.3.3.2.3,
provided that the temperature or pressure specified in the standard is such that it will ensure that the shell is safe and suitable for its intended use.