A mark of General Motors' confidence in their plans for the small car sector, and something that the Opel Kadett and the Vauxhall Viva had in common, was that the manufacturer built for each new model a completely new car plant in a region characterized by relatively high unemployment and the availability of a skilled workforce, but with no strong tradition of volume auto-making. The Vauxhall Viva was the first car built at Vauxhall's Ellesmere Port plant while the Kadett A was the first product of Opel's new purpose built Bochum plant. Ellesmere Port and Bochum would effectively become sister plants, producing subsequent generations of Kadett as well as their Vauxhall badged sisters (the Chevette and Astra) for the next fifty years.
It had some crazy mechanical issues. At one point it stumbled and stalled because the carburetor had come loose from the intake manifold and I had to tighten it back down! Another time, my brother was driving it and the brakes failed. Somehow the end of the brake shoe that meets the brake cylinder piston had become worn on one side, causing the piston to slip off the end of the shoe when the brakes were applied, losing braking and squirting fluid all over.