If you've got a colour problem I suggest you read the Collective Colour Blindness thread. It's rather large, you can't miss it.
All JAA countries use the same Ishihara test for initial colour screening (the book of dots, I'm sure you know the one). If you fail that there are currently 4 "lantern tests" you can take. Not all are available in the UK. Knowing how these tests operate is a large factor in being able to pass them, and the thread I mentioned has lots of detail on this. I myself had a similar problem and it took me years to get the restriction removed.