Welcome to NICO!
Here's a link to the factory service manual (FSM) for the 2009 370Z. I recommend downloading the entire maual to have as reference, but the part that addresses your immediate concern is: EXL (Exterior Lighting). I don't know what the standards are in the UK so you may need to check into that, but page 158 has the "target area", for lack of a better term, of the headlight beams, and page 157 has the procedure for adjusting the beams.
Good luck with the test! Post some pics of your Zed when you can!

There aren't too many 370Z owners on here yet.
Where in the UK are you?