All cars must be registered with the HSCC or have FIA Historic Papers. If in any doubt about eligibility of any car, contact the series eligibility scrutineer. Cars are run with Avon control tyres. These are cross-ply Formula 3 slicks and wets. They are available through BMTR, who will support the Championship with a tyre service at most HSCC meetings. Eligible drivers must be racing members of the HSCC and Classic Formula 3 Association and must hold an RAC MSA National B race licence or higher. The HSCC also runs Derek Bell Series races for Category G, H and I single seater cars in the UK at most of its race meetings and other European races are circulated to competitors as they become available.

Providing they are to original specifications all Classic F3 cars would fall into FIA Category G, H or I for International Historic racing