More commonly called simply the Morris 12, the Series 3 featured a new 1548cc overhead valve engine and a 12 volt electrical system and a 4 speed gearbox with synchromesh on second, third and fourth gears.
The twin windscreen wipers were very advanced, featuring remote silent drive and independent operation.
Particular care had been taken to ensure draught-free ventilation by scuttle ventilators and hinged rear quarter-lights. The windscreen was hinged at the top for clearer sheltered wet-weather unmisted vision after dark. The front windows were fitted with louvres and, when open, the windows provided an extractor effect at their rear edge.
There was an automatically actuated stoplight at the back of the car, also very modern!