Here is the points, behind the headlight there is a hole in the wing, there should be a pipe there with a plastic screw which you can unscrew. It may have been tampered with previously and is now lying behind the bumper out of sight.
Liam
the only hole I can see behind the headlight is in the inner wing, the window squirter hose and electrics goes through it
only other hoses from my header tank, is the one at the bottom which goes direct to lower hose on rad from the water rail end. and the smaller tube that goes from top of header tank to under the air filter housing / spi area
couple of pics