Originally Posted by greatbm
Where HID or LED dipped beam headlamps are fitted the tester will switch on the headlamps and check the operation of any headlamp levelling and cleaning devices fitted.
The car will fail if a headlamp levelling or cleaning device is inoperative or otherwise obviously defective.
If a headlamp bulb is not seated correctly the resulting beam pattern will be indistinct and this will result in a test fail.
As I understand the new regulations from reading other posts on the subject:
Headlamp leveling & cleaning devices must be effective when fitted, but NOT having them fitted is not sufficient reason to fail the car