# The Motor Vehicles (Designation of Approval Marks) Regulations 1979, Paragraph 14


(1) In the marking relating to items No. 16 and 16A in Schedule 2 there shall be added above the circle:
(a) the letter “A” in the case of a three-point belt,
(b) the letter “B” in the case of a lap belt, and
(c) the letter “S” in the case of a safety belt which is neither a three-point belt nor a lap belt.
(2) The letters referred to in sub-paragraph (1) above shall be preceded by the letter “Z” when the safety belt is part of a restraint system.
(3) The letters referred to in sub-paragraph (1) above shall be supplemented by:—
(a) in the case of a safety belt fitted with an energy absorber, the letter “e”; and
(b) in the case of a safety belt fitted with a retractor, the letter “r” followed by:—
(i) the figure “1” if the retractor is a non-locking retractor, or
(ii) the figure “2” if the retractor is a manually unlocking retractor, or
(iii) the figure “3” if the retractor is an automatically locking retractor, or
(iv) the figure “4” if the retractor is an emergency locking rectractor, or
(v) the figure and letters “4N” if the retractor is an emergency locking retractor with higher response threshold,
followed by the letter “m” if the retractor is an emergency locking retractor with multiple sensitivity.
(4) In the case of a marking prescribed at item 16A in Schedule 2, the marking shall bear a symbol consisting of a rectangle with a motor vehicle in category M1 crossed out if the safety belt is fitted with a retractor which during normal driving conditions does not restrict the freedom of movement by the wearer of the safety belt, but has special properties as regards its use in vehicles in categories M2, M3, N1, N2 and N3.

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Source: https://www.legislation.gov.uk/uksi/1979/1088/schedule/3/paragraph/14 (the official version)
Page: https://openlegislation.uk/motor-vehicles-designation-of-approval-marks-regulations-1979/schedule-3/paragraph-14
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.