Basically the MOT legislation has a number of grey areas however as long as your lights don't dazzle/have the correct beam pattern then you will be fine. My headlights have the correct projectors with a cutoff line which won't dazzle so no problems there.
There is also confusion with washers and self levelling. In simplistic terms, if it's on your car then it needs to work, if not then they can't rest it and ultimately fail it. I'm sure you will remember the spare tyre issue...if you have a spare tyre it must be legal, however if it's not there then they can't test it and thus can't fail your MOT.
Hopefully this helps answer your queries. And if it's any use for those out there, the wife's car us a set of H7R Hids fitted and they passed the mot without any issues.
Cheers
Rob