8. Oil Systems
8.1. Have any oil tank which is situated outside the chassis or main structure of the Vehicle suitably covered with a protective coating( e. g. GRP). On rear engined Vehicles no part of the oil tank may be located to the rear of the gearbox casing. Vehicles of period A to D are exempt from this requirement.
8.2. Have any engine oil tank breather or overflow tube venting into atmosphere led into catch tanks which have a minimum capacity of 2 litres. For engine capacities in excess of 2 litres the catch tank capacity must have a minimum capacity of 3 litres.
8.3. Have catch tanks of translucent plastic or with a transparent inspection panel capable of being readily emptied. In any parallel system of catch tanks each tank must not be less than half the minimum required capacity. Containers of cross section of less than 46 sq cm are prohibited.
8.4. Positive crankcase ventilation systems breathing fluids directly into the inlet manifolds may be accepted as an alternative to catch tanks but breather systems and catch tanks must be used in such a way as to prevent oil from spilling onto the road / Track.
9. Fuel Systems Chapter 7 App. 4
9.1. These must be equipped with an effective method of stopping fuel supply and operable by the Driver when normally seated. This to be combined with or located adjacent to the internal ignition cut-off switch.
10. Electrical Equipment Circuit Breakers and Ignition Components
10.1. Vehicles must be equipped with an externally operated circuit breaker having positive ON-OFF positions clearly marked.
10.2. An external circuit breaker is not mandatory on open cars of Periods A to F but is strongly recommended.
10.3. The internal ignition cut-off and fuel pump isolation system( s) must be operable by the Driver when normally seated irrespective of whether a safety harness is worn or not.
10.4. Not have any ignition components which may run at a voltage exceeding 60V located in the cockpit area in Racing Cars. Vehicles of periods A to E are exempt from this requirement.
10.5. Except for Racing Cars, Clubmans Cars, 750 Formula, Legends Cars and Period A to E, all Vehicles must be equipped with a pair of brake lights equally disposed about the Vehicle centre line, on the same horizontal plane with a minimum of 300mm between them and which are directly operated by the braking system without any time delay.
11. Safety
11.1. Be fitted with a safety roll-over bar( ROPS) complying with ASN requirements as specified in Chapter 7 except for Vehicles of Periods A- E inclusive.
11.2. It is strongly recommended that all Vehicles be fitted with safety roll-over bars.
11.3. Be fitted with currently FIA Homologated safety harness to be worn at all times by the Driver during training, Practice and Competition unless the Vehicle was constructed in Periods A to E.
11.4. If fitted with lightened non-standard doors the Vehicle must be fitted with a horizontal safety bar across the door( s) aperture below the line of the window and at a suitable height to protect the Driver. This must not be integral with the door.
11.5. Have any forward facing lamps of more than 320 sq mm in surface area adequately protected and secured in case of glass breakage.
11.6. If permitted by the Official Documents all forward facing lights may be removed including Headlights sidelights and direction indicators.
11.7. Not pass fluids through any chassis tubes in space frame Vehicles.
11.8. Glass sunroofs are not permitted. Sunroofs may be of a non-shattering solid material other than glass. The sunroof aperture may be closed by solid material permanently fitted in place.
Motorsport UK 2025 National Competition Rules Version 11
Chapter 12 Appendix 13- Competitors Vehicles Technical Regulations 429