c. extend downward behind the wheel.
6.10. Aerodynamic devices may only be fitted to Racing and Sports Racing Cars( unless prohibited by an Approved Formula) or where specifically permitted where FIA homologated or where complying with National type approval.
6.11. Such devices must not extend beyond the maximum width of the Vehicle above the maximum height of any roof or for an open car the maximum height of the ROPS.
6.12. For Saloon and Sports Cars such devices must not extend longitudinally from the bodywork by more than 100mm.
6.13. For Sports Racing Cars such devices must not extend longitudinally from the rear wheel axis by more than 1100mm.
6.14. Racing Cars must comply with Chapter 12 App. 14.
6.15. If originally fitted with Driver / Passenger doors hatchback doors sliding doors opening boots or tailgates these must be secured in the closed position during Events.
6.16. Have effective means of ventilating closed cars.
6.17. Tinted glass in any window which can significantly affect through vision( in or out) or distort the colours of signal flags or lights is prohibited.
6.18. With the exception of Cross Country Vehicles Racing Trucks and Karts in all Vehicles with the Driver seated normally the soles of their feet resting on the pedals in the inoperative position shall not be situated to the fore of the vertical plane passing through the centre line of the front wheels.
6.19. Art. 6.18 above is not applicable to Vehicles constructed prior to 1.1.99 or for those Vehicle designs which have participated in an ASN Permitted Championship prior to 1.1.99.
7. Seating App. 7 Applies 7.1. Must have a normal adequate seat for the Driver( and any permitted Passenger).
7.2. With the occupant seated the seat must be correctly located and securely anchored within the compartment and must not tilt hinge or fold unless it is a production seat fitted with a serviceable locking mechanism preventing independent operation.
7.3. The seat must support and retain the Driver within the Vehicle.
7.4. The seat cushion( i. e. the part on which the occupant sits) when uncompressed must not be less than 152.5mm below the top edge of the adjacent body side or door.
7.5. Any other seats fitted must similarly comply and all seats must face forward. Vehicles of Periods A to D are exempt from this requirement.
7.6. If a single seater the maximum time for a Driver to get in or out of the Vehicle must not exceed 10 seconds.
8. Engines
8.1. Paddock Safety: In areas to which the public has access no engine shall be run with the gears engaged whilst the Vehicle has any driving wheels not in direct contact with the ground unless all moving parts are adequately guarded and with the exception of Karts a competent person is seated in the driving seat.
8.2. If forced induction is used the coefficient will be 1.7:1. unless stated otherwise in Specific Technical Regulations or Official Documents.
8.3. Must be equipped with a positive method of throttle closing by means of external spring / springs so that in the Event of failure of any part of the throttle linkage the throttle( s) are sprung closed.
8.4. Vehicles fitted with electronic throttle control as standard original manufacturer’ s equipment for that Vehicle are exempt from Art. 8.3 above.
Motorsport UK 2025 National Competition Rules Version 11
Chapter 7 Appendix 2- General Technical Regulations 244