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24.—(1) Where an inspector considers that a test of a meter measuring system is necessary, otherwise than for the purposes of regulation 23(3), he may require the person who has control of the instrument, or whom he has reasonable cause to believe has control of the instrument (“the controller”), to provide to him such equipment, test liquid, materials, qualified personnel or other assistance as the inspector may reasonably require.
(2) No meter measuring system shall be tested until it is installed ready for use and complete with all its parts.
(3) A meter measuring system shall be tested by an inspector under practical working conditions with a test liquid which shall be—
(a)the liquid fuel that the instrument is intended to deliver; or
(b)a liquid having properties which replicate in all respects relevant to testing those of the liquid fuel that the instrument is intended to deliver.
(4) An inspector may open a locked or sealed tank or container for the purpose of testing a meter measuring system or returning any liquid withdrawn during testing.
(5) Any liquid withdrawn during testing shall be—
(a)returned to the tank or container from which it was withdrawn if the inspector is of the opinion that it is reasonable and practicable to do so and the controller agrees; or
(b)placed in another suitable receptacle reasonably convenient for the purpose that is provided by the controller.
(6) An inspector, if requested to do so by the controller, shall give to him a signed and dated statement of the quantity of liquid withdrawn during testing.
(7) An inspector shall—
(a)securely re-fasten any tank or container opened under paragraph (4) immediately after the conclusion of any test or after returning any liquid withdrawn during testing;
(b)replace any sealing device broken by him; and
(c)affix to that replaced sealing device a marking, the design of which shall be published by the Secretary of State.