BTRDA Rally Series is a rally series in Great Britain.
The BTRDA (British Trials and Rally Drivers Association) was formed in 1938 by a group of disgruntled participants in the London-Gloucester reliability trials.
The event had been promoted as suitable for amateurs with ordinary road cars, but proved so difficult that only two cars completed.
[1] Originally, BTRDA organised only sporting trials (first champion listed is Ken Wharton in 1948),[2] only adding rallycross (first champion listed is Trevor Reeves in 1977)[3] and Allrounders championships in the 1970s.
[4] According to The World of Automobiles, the BTRDA event is the most important trials championship in the UK.