Being more pedantic, is a 7.5 tonner an HGV? After all, there is such a
thing as an HGV licence...

I think it is technically an MGV. HGVs no longer exist. They're called LGVs
now. You need category C1 (or C) to drive an MGV and C to drive an LGV. You
need +E if you want to attach a large trailer, or the vehicle is
articulated.

Christian.