Thank you all for your comments so far. A few observations now it's dark and I've had chance to use them.
The light is extremely white blue, certainly as white as xenons (The bulbs are 5000k).
It is made by Philips for H7 lamps and therefore the cut off is perfect and there are no hotshots or glare. I've walked around the car at different distances to spot glare and there is none. On my test drive no one flashed me on dual carriageways or indeed on narrow roads. The bulbs live up to their billing as ultimate xenon effect bulbs, however, I'd be surprised if they lasted as long as normal bulbs. My car is due it's MOT next month so we willfind out if it passes or not!
Two points on the insurance front; "Insurance companies will do anything to get out of settling a claim"- as someone in "Insurance", that isn't true. They will not pay out for modifications that aren't declared but they would always pay out for insured losses and expect good client satisfaction for doing so. That said one does need to declare if you have modified your vehicle. I have declared "lighting modified-unspecified". ie I've done something but I've not had to say what it was and there was no additional premium. HTH
