Also this MOT loophole you mention doesn't allow HID's to be retrofitted into vehicles which weren't originally equipped with them, in contrary to the law. It is perfectly legal to fit after market HID's to a vehicle. The MOT test states that if a vehicle is fitted with lights which exceed a specified brightness, which HID's and LED's do, either as original equipment or as an after market extra, the car must also be fitted with headlight washers and self levelling devices. As both these types of lights are brighter they have a greater chance of dazzling oncoming drives. These 2 devices help to reduce and possible dazzle to oncoming drivers. The loophole which you mention is surrounding the checking of these 2 devices. While it is possible to visually check if a vehicle is fitted with headlight washers it is not possible to check if a car is fitted with auto levelling devices without physically lifting one end of the car to check the operation of the levelling device. This is outside the testers remit so the benefit of the doubt has to be given that the levelling device is fitted. However if the tester see's the manual headlight adjuster on the dashboard, indicating the operation is not automatic, they are required to fail the car. But only a very beady eyed tester would see this manual adjuster so it is usually overlooked. This subject has been covered extensively before on many threads.