Thanks Bad Med.
The setup of my test was not like you describe, especially in the setup of the machine.
Would this contribute to a failure?? In real life I can see the differences in colours on the aprons, tower beacons etc - green/white is sometimes a little 'tricky'.
I see you are located inAustralia. Can I PM you for more details about where you conduct these tests and possible organise a 'resit'?