Thanks for the related replies to my original post.
Although I've not yet taken the exact test that the RAF have asked me to, I've previously taken part in tests and research for university and CAA purposes. The results identified me as a dichromat - meaning I have moderate to severe colour blindness of the "Red-Green" variety.
Due to what's been mentioned above, I'm going to work on the fact that the CP2 standard still stands and I will have to consider another career.