If you passed your driving test before 1 January 1997 you will automatically have “Grandfather Rites” to category C1 entitlement which means you can drive goods vehicles up to 7.5 tonnes and with a trailer of no more than 750kg. If you passed your test after 1 January 1997 you are allowed to drive vehicles up 3.5 tonnes (check the Gross Weight on the vehicles plate).