Welcome to Chelmsford Car Company Limited. Part Exchange. Free Finance eligibility check - includes POOR CREDIT. Online finance application - NO deposit required. All MINI's are given a multi-point workshop inspection. All MINI's come with a warranty included - extensions available. Chelmsford Car Company is Britain's largest independent MINI dealer. As a Family run MINI Specialist with a well established reputation, we take a lot of pride in how we do business and how we present our cars. Customers coming from as far as Aberdeen would confirm that it is worth the trip to Essex's oldest car showroom.