Welcome to Hamlet Cars, Hertfordshire Welcome to Hamlet Cars, used car and van sales in Welwyn Garden City, Hertfordshire. Hamlet cars has been established in these premises since 1998. A family owned and run business which over a number of years has gained a reputation for providing high quality vehicles, excellent after sales support and high quality servicing which is considered second to none in the local area. All repair works and vehicle preparation is undertaken at our premises. We are the areas authorised repairer for the warranty company we use. Please visit our showroom for more details.