# The Gas (Road Fuel) Regulations 1972, Regulation 6


No person shall mix or cause to be mixed gas upon which the duty has been charged with gas upon which the duty has not been charged or with any other substance, save with the authority of the Commissioners and subject to such conditions as they impose.

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Source: https://www.legislation.gov.uk/uksi/1972/846/regulation/6 (the official version)
Page: https://openlegislation.uk/gas-road-fuel-regulations-1972/regulation-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.