For social domestic & pleasure use  and use by the insured in connection with their buusiness and use necessitated by the overhaul upkeep and / or the repair of the vehicle

FOR DUMMIES 

This class of use gives the social, domestic & pleasure use and also gives an extension to use the vehicle for business use. However this is only for personal business use and does not allow you to use the car for the business of someone else, only your personal business. This does not normally include the carraige of goods in connection with your buisiness.