Can you drive a tractor unit with cat.C only?

Yes.

When they changed the categories from Class 1 and 2 to C and C+E. A unit on its own requires a C entitlement the E entitlement is the addition of towing to your C licence.

Under the old rules of Class1 and 2 you had to have a class 1 licence to drive a unit.

Sent from my AGS-W09 using Tapatalk