If you are currently a car driver and you want to start a career in HGV driving there are certain things you need to do before you start training in a vehicle.
If you currently hold a lower licence in the category you wish to train in you will not need to redo a medical or the Theory Tests.
E.g if you currently hold a C1 and you wish to train for C+E
* You will still need to hold the provisional licence for the one you want to train for
If you currently hold a licence in a different category, you will need to start from the beginning
E.g if you currently hold a D1 and you wish to train for a Category C