The BMC ADO16 was a family of economical small cars built by the British Motor Corporation (BMC) and, later, British Leyland. It was launched in 1962 and for most of the next decade the ADO16 was consistently the UK's best-selling car.

The MG 1300, as seen here, is one of the many different models produced around that design during that time.

Source: en.wikipedia.org/wiki/BMC_ADO16