Legacy Metrics

1970 Royale RP4

12RPracingUnited Kingdom

The Royale RP4 is a lightweight British sports-racing car from the early 1970s, built around a semi-monocoque chassis with double-wishbone suspension and four-wheel disc brakes, weighing just 463 kg in dry trim. Designed for club and national circuit competition, this example carries extensive period documentation including expired FIA papers, race results, photographs and press cuttings. It is currently an unfinished rolling chassis project, fitted with a rebuilt 1,600cc Ford Kent Crossflow engine and Hewland Mk8 gearbox, awaiting completion.

Ownership

  1. 2026-02-20Auction sale
  2. Date unknownAcquisition unknown
    Deceased husband of vendor
    partial documentation

    Had partially dismantled the car with the intention of rebuilding and preparing it for use, but passed away before the work could be completed. The car was offered for sale by his surviving spouse.

Competition

No competition history extracted from the catalogue.

Maintenance & restoration

  1. Engine rebuild
    Mass Racing Developments

    The 1,600cc Ford Kent Crossflow engine was rebuilt by Mass Racing Developments; the exact date of the rebuild is not recorded. Weber carburettors are fitted.

    A Lotus Twin Cam engine may also have been installed at some point, based on suggestions accompanying the car's documentation.

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This car's public record is built from its auction and competition history. Register your ownership and privately add your own records to make it a verified Legacy Metrics passport — provenance that backs your car's value at sale and gives your insurer evidence to price against. Roy reviews and verifies every registration personally.

Each chassis record is compiled from public auction archives and links to its source material. Ownership, competition and maintenance entries are extracted from those catalogue listings by an LLM, which can make mistakes — please contact us with any corrections. The summary is Legacy Metrics’ own writing; we do not reproduce catalogue text.

“Full” and “partial” documentation labels indicate how well each entry is corroborated in the underlying sources, not an audit of the car’s physical paperwork. Names of recent or living owners are withheld for privacy.