As a result, parallel importers found it more difficult last year to get their cars approved for sale here. Furthermore, as the WLTP is a more stringent standard, models brought in with these readings often fare worse in VES bandings.

For instance, a car could have had a VES rebate of $10,000 under NEDC, but loses it when it is tested under WLTP - a standard which is supposedly more reflective of real-world driving conditions.