Cheers TT, yep they level and they start up fine. He suggested that one seemed up and the other down, I cant see it myself.
Maybe he's getting confused with the double 'dog-leg' from both headlamps?

Xenons generally have a much greater definition to their beams - especially the top cut-off, and the left side 'kick-up'. And don't forget, many peeps still don't understand that Xenons produce a much brighter, and different shade of light - so may not be used to them.
Just wondered if there was any manual adjustment, in the old days we would stick the nose of the car against a wall and note the centres then do something I cant remember to ensure they were even.
You still can do that!

As Dubbin stated, each headlamp has two white 6mm allen socket adjusters. Look very carefully at the black headlamp casing surrounding each adjuster, and it tell you which way to turn them for up, down, left or right.
One of the recurring issues with Xenons isn't that the height is correct - but the vertical alignment is out - ie, they don't point straight ahead, but actually point to the left or right.
I'm due an MOT, pretty sure they will check it out anyway.
Adjustment isn't officially part of the MoT - some may adjust them for you, others will simply fail it!