Alot of things are legal requirements but are they all followed. What I am simply saying is if you want to fit them then your car you do not need to worry about failing the MOT which alot of people do. Plus if they are correctly adjusted (which they would be) i highly doubt or have heard of anyone being stopped by the police due to them not having levelers or washers!
But not only are they NOT legal - they are actually highly dangerous - which is why the governments DfT have issued very strict instructions to both VOSA and ACPO. Furthermore, if you have a prang in your car with illegal Xenons, then your insurance will be INVALID, and if the dodgy headlamps are found to be a contributory factor to the accident, not only will you be prosecuted for no insurance, you will also be prosecuted for attempted MANSLAUGHTER - and you will be on your own!
Stop buring your f.ing thick head in the sand - these are illegal and dangerous!