What's a ULEV?
As Dirkh says Ultra Low Emission Vehicle.
In EU this means any vehicle producing < 75g CO2 per km under the NEDC tests. The only practical way to achieve this is with a BEV or PHEV (I'm excluding H2 cars as we don't have any available yet).
It is a bit of a joke with the likes of the Outlander and i8 on the list, which in many cases never going near an electrical point, such are the tax advantages.
This is the UK GoUltraLow website produced with some government backing:
Car Menu - Go Ultra Low
Notice any obvious omissions? (Hint strange as Elon was supposedly the UK's EV Tsar!)