2.Categories M2 and M3 U.K.
2.1.Type of vehicleU.K.
2.1.1.A ‘type of vehicle’ shall consist of vehicles that have the following features in common:U.K.
the manufacturer's company name.
A change in the legal form of ownership of the company does not require that a new approval has to be granted;
the category;
the following aspects of construction and design:
the design and construction of the essential constituent elements forming the chassis;
the design and construction of the essential constituent elements forming the body structure in the case of a self-supporting body;
the number of decks (single or double);
the number of sections (rigid/articulated);
the number of axles;
the mode of energy supply (on-board or off-board);
2.1.2.A type of vehicle shall consist of at least one variant and one version.U.K.
2.2.VariantU.K.
2.2.1.A ‘variant’ within a type of vehicle shall group the vehicles that have all of the following construction features in common:U.K.
the type of bodywork as defined in point 3 of Part C;
the class or combination of classes of vehicles as defined in paragraph 2.1.1 of UN Regulation No 107 (only in the case of complete and completed vehicles);
the stage of completion (e.g. complete/incomplete/completed);
the power plant with regard to the following construction features:
the type of energy supply (internal combustion engine, electric motor or other);
the working principle (positive ignition, compression ignition or other);
the number and arrangement of cylinders in the case of internal combustion engine (L6, V8 or other);
in the case of multi-stage built vehicles, the manufacturer and the type of the previous stage vehicle.
2.3.VersionU.K.
2.3.1.A ‘version’ within a variant shall group the vehicles that have all the following features in common:U.K.
the technically permissible maximum laden mass;
the ability of the vehicle to tow a trailer or not;
the engine capacity in the case of internal combustion engine;
the maximum engine power output or the maximum continuous rated power (electric motor);
the nature of the fuel (petrol, gas oil, LPG, bi-fuel or other);
drive-by sound level;
exhaust emission level (for example Euro IV, Euro V or other).