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Vauxhall Motors used the 12 name for two different cars in the 1930s.

• Vauxhall Light Six

  

  The 1933 Light Six was available in two engine sizes, 12 hp and 14 hp. It was updated for the 1936 Motor Show with a rounded grille.
• Vauxhall 12-4

  

  A total redesign introduced in September 1938 and given the 12-4 name, the new model featured a longer six-light body based on the Vauxhall 10 and a 4-cylinder 1.4-litre engine