40 AC Two-litre

With its ash frame, aluminium body and steel chassis, the AC can be a can of worms waiting to be opened if unrestored or showing its age. However, look carefully and you can buy a well-looked-after example for just under the £15k mark, making it a bargain six-cylinder alternative to a Jaguar. Steer clear of restoration projects and those needing engine rebuilds unless you have deep pockets: the engine alone can cost upwards of £14,000.