Compton1:
So I explained D1 test is same as D driving test
No it’s not, D1 is for PCV vehicles with up-to 16 seats.
Compton1:
Having passed C LGV is for large vehicles
Cat C is for large goods vehicles.
Compton1:
And I was probably the 1st person to enquire about a automatic upgrade
Yes you probably was the first person to ask for an automatic upgrade from D1 to D 
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