Hi I am thinking of upgrading to HID light, has anybody done has? If so does it put errors (blub out)on the screen?

Or just get the Xenon headlight units ( they are pricey and rare though).

you will blind eveyone and get nicked, you can get legal better bulbs now such as osram night breaker ultimate

I installed Xenon bulbs two years ago, they're fine as long as you remember to use the little height setting control when heavily laden in the rear. Very good cut off, ours are only k4,000 so not stupid blue - they come out for the MoT and go back in again. We have superior bulbs in the main beam too and LEDs in the sidelights.