# Hydrocarbon Oil Duties Act 1979, Paragraph 4


(1) An unlicensed vehicle at a time when it is used—
(a) for purposes relating to agriculture, horticulture, pisciculture or forestry,
(b) on a golf course or on land maintained by a community amateur sports club, or
(c) on land occupied by a travelling fair or travelling circus.
(2) An unlicensed vehicle used in any other circumstances provided it uses fuel gas for fuel.
(3) In this paragraph, “unlicensed vehicle” means a vehicle that is—
(a) unlicensed for the purposes of section 22(1D) of the Vehicle Excise and Registration Act 1994,
(b) kept by a person who has complied with such requirements relating to the vehicle as are prescribed for the time being in regulations under that section, and
(c) not used or kept on a public road.

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Source: https://www.legislation.gov.uk/ukpga/1979/5/schedule/1A/paragraph/4 (the official version)
Page: https://openlegislation.uk/hydrocarbon-oil-duties-act-1979/schedule-1A/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.