BTRDA Rally Series
BTRDA Rally Series is a rally series in Great Britain.
The BTRDA 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. Originally, BTRDA organised only sporting trials, only adding rallycross and Allrounders championships in the 1970s.
According to The World of Automobiles, the BTRDA event is the most important trials championship in the UK.
