No fitting them to your micra would be illegal unless your headlights or car were auto-levelling and you had headlamp washers.
If I fitted them to my vectra it'd be illegal unless I replaced the headlights for self levelling ones but perversely you could fit them to a Citroen DS if you put some water jets to wash the headlights, because the car itself is self levelling.
But to be perfectly honest, very few people would pick up the fact you've got an illegal HID installation. Although there's always an outside chance you get pulled by a traffic bobby in a bad mood.
