just to add, lets not turn this into a legality thread.
A factsheet is NOT law. Speak to DFT with any knowledge and you'll have them in tangles. Besides, nothing is enforced if you stay sensible on the color. I chose 4300k as it is white and can't even tell they are HIDs.
Lets use some common sense and think for ourselves - no dazzle, no problem. HIDs do nothing but increase my safety in driving without affecting others. Mine isn't a chavtastic car with blue lights on, but a normal car with decent white lights.
MOT tomorrow, so they'll be a able to align if necessary - bulbs were a little fiddly to get in.
Lets knock it on the head there.