In the 1960s, British engineers were developing a mobile tank in collaboration with German and American companies. Some foreign components were used: a power unit, suspension, and several other elements. At the same time, some concepts and elements of the Chieftain were also adopted. It was supposed to be armed with a 110 mm gun and a 25 mm automatic twin gun. The vehicle was designated Nemesis. Compared to the heavier Chieftain, the vehicle was supposed to be much faster and bore some similarities to German projects of the late '60s and early '70s. The Nemesis project existed only in blueprints and in one scale model.