The bloody annoying part is the way you are not allowed to make many errors on the Ishihara plates with the CAA/JAR.
You are allowed up to seven errors on the 25 plate for the FAA, hence I have an unrestricted FAA Class One, but cannot get a CAA/JAR Class One.
Mad.
I can use the same airspace at night/IMC, but only with an "N" on the tail. And do.....
Incidently, after passing a Titmus 2 test I now have the letter from the FAA that means I never have to take another colour vision test for an FAA medical. Why not JAR??????