The project was first code-named RT1 (for Rover Triumph Number 1) but then soon changed to SD1 (for Specialist Division Number 1) as Rover and Triumph were put in the new "Specialist Division" of British Leyland.
Projektin koodinimi oli aluksi RT1 (Rover Triumph numero 1), mutta nimeksi vaihdettiin pian SD1 (Specialist Division numero 1), kun Rover ja Triumph liitettiin British Leylandin uuteen "Specialist Division" -osastoon.