If, for instance, someone wanted to apply for C and D provisional, would they be able to make the applications at the same time, using the one medical? Just a thought, been wondering for a little while…
Yep just tick all the box’s on the application form as I did
Yes.
Just tick both boxes.
You can also have D1 if you like 
Yes and it’s a good idea to so even if you don’t yet plan on doing the PCV test.
As above. You will automatically get the sub classes (C1 and D1) when you apply for provisional C and D. Always makes sense to get both as it can avoid a medical at a later date.
Good luck, Pete 
It’s just something I’d wondered about, I’m still waiting for the DVLA to sort my application for C, but might phone and see if they’ll add the D as well, already got D1.
SuffolkLad:
It’s just something I’d wondered about, I’m still waiting for the DVLA to sort my application for C, but might phone and see if they’ll add the D as well, already got D1.
I am assuming you mean D1 with a 101 code?