Welcome to Ceir Seiont Cars Ceir Seiont Cars is a small family company based in Bethesda, Gwynedd, dedicated to selling high-quality used cars. Ceir Seiont Cars is the place to go if you're looking for a used vehicle. Ifan started the company as a sole trader in 2018, selling one to two cars per week. The business has become stronger and more popular over time, selling an average of 8 cars a week. Buying new premises to expand our business was a difficult decision to make because money was still tight at the time, but we took the risk and haven't looked back since. The company is led by a small, friendly, professional, and well-informed team.