Still ambiguous regarding non aftermarket kits.
There are to be some changes to the MOT test from 1st January 2012 which are being introduced in response to European Commission Directive 2010/48/EU of the 5th July 2010 and which will effect those with aftermarket HID headlights and remapped ECUs:
4.1.4 Compliance with requirements:
(a) Lamp, emitted colour, position or intensity not in accordance with the requirements
(b) Products on lens or light source which obviously reduce light intensity or change emitted colour
(c) Light source and lamp not compatible
4.1.5. Levelling devices (where mandatory):
(a) Device not operating.
(b) Manual device cannot be operated from driver’s seat.
4.1.6 Headlamp cleaning device (where mandatory):
Device not operating.
HID lights – Specifically those aftermarket kits that give the very bright headlight beams. Any cars found with these kits will be an automatic MOT failure. Testers are able to easily spot the difference between HID kits, and manufacturer fitted Xenon’s. Easy to spot as Xenon cars have suspension level sensors, in car beam adjuster, and usually headlight washers.