Seems a rather grey area with multiple arguements on both sides.
One major point to consider if that the headlamp lens will have been specifically designed and shaped for either Halogen or HID lamp. Retro fitting a HID lamp kit into a headlamp unit designed for a halogen lamp will fall foul of the law as the nbeam pattern will not be correct. This seems to be the biggest issue effecting the legality of HID upgrades.
I've just noticed something I haven't seen before on that link. "Under the Road Traffic Act 1988 it is an offence to supply, fit or use vehicle parts which are not legal".
So the retailer is committing an offence by supplying them, but they could argue the case differently, if they say they advised people not to fit them unless they have self levelling and auto clean. But these guys are clearly mis-leading people and encouraging them to break the law. Not right really!
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