Whitelabel - Thanks for the address !
Do they give you the full range of tests, help you understand which you can pass, what Gatwick use etc? I'm hoping so!
Yes they do give you a range of tests (not all though), but certainly the main ones used at Gatwick. They do tell you the colours before you test which is fairer and I found that they allow you plenty of time to let your eyes acclimatise to the dark.
They provide you with a written report on your specific condition. All very useful if a little bit expensive.
They also advised that there are different tests in different JAR countries and the protocol for test standards differs as well.