Asilano

Hi chaps, I've got a '54-plate Roomster which I'm taking to Europe in the next couple of weeks. I've read that some headlamps can be adjusted to a flat pattern to avoid dazzling by means of a simple lever in the headlight unit. I've checked, and I have the lever! Joy of joys. What I can't find a definitive answer on is - which direction does it need to be pushed? I've found some sources saying that the flat pattern is down on both sides, and some sources saying down on one side and up on the other... Can anyone tell me for definite what's right? Thanks!