Motor trade. Negligent workmanship on a customer’s vehicle or the sale of a defective part by a motor vehicle repairer may cause an accident. The resultant liability can be insured under a motor trader’s comprehensive road and garage policy, or as an extension of the internal risks policy. ‘Workmanship’ means ‘repair, servicing, or maintenance’ and includes the pre-delivery check of a new vehicle and MOT tests. The widest available cover embraces: negligent workmanship, sale of spare parts and liability for damage to the customer’s vehicle. 2. Public liability.