Castle Three Motor Company is a British automotive manufacturer originally active from 1919 to 1922, known for producing the Castle Three, a three-wheeled cyclecar equipped with a four-cylinder, water-cooled engine. In August 2013, Castle Three Motor Company Limited was incorporated in Alnwick, Northumberland, with plans to develop, manufacture, and sell new-generation three-wheeled sports cars for the recreational and motorsport markets. The…