Levelers are the ones that if you retro fit, and have a headlight height adjuster from having Halogens previously on the dashboard thats now inoperative, then that can be seen as a failure. Either get a dashboard Blank like the R32's have because xenons are factory fit if you wanna take the chance, but from April, laws are tightening and even though i know my MOT tester, ive been advised to do this as my car has retro fitted set up the same as Skavia, I have a dashboard switch which is inoperative, which could been seen as a risk.
Thats how i read the new laws coming in from 1st April.. but each person can read it differently.