ive seena few cars up this way with the very blue led side lights, now from other forums ive seen that these are for off road use only.
however i had the blue/white one from halfords and they were said to be road legal. looked only ever so slightly blue-ish and a lot whiter than stock. not bad for 3 quid i thought. i only ever use side lights tbh when pulling up to the guards at work.