Unfazed, based on your hunches I wouldn't advise you wager anything.
I am not a "UK medical examiner" nor a CVD pilot. I am an 18000hr pilot with 5 sons one of whom does want to become a commercial pilot and has had a CVD problem which drew me to this thread. Hopefully that satisfies your qualification criteria ? I am sorry you thought the posting was the "biggest load of BS you had seen in a long time". It was based on a combination of a considerable degree of experience in both jurisdications, together with some opinion and very recent (first hand) discussion with the relevant authority.
Your judgement of the "naff system" we have here in the UK, is not one that I share, nor do I suspect many other people do, some may have a particular axe to grind ?
It really doesn't matter how "Global" an activity you feel aviation is, since clearly that is somewhat rhetorical and obvious. There are still many variations in so many aspects of it. Obviously as in this topic, the medical standards vary. The training requirements vary, the licensing requirements vary, the regulatory requirements vary. How ever much you try and torture the logic, it cannot be made to suit the outcome of your own individual grievance. Many "high time" US pilots might well undertake UK/JAR medicals, however they are still subject to the same standards as national applicants. A UK or European citizen undertaking an FAA medical is also subject to that jurisdictions standards, but to operate only insofar as that jurisdiction allows.
The colour vision requirements in the UK are laid down by the authority as are the licensing requirements. There are many differences. It does
not follow that if one authority has a different standard or requirement that standard or requirement then necessarily becomes illogical. There are situations where a CVD would present problems ( read back through the posts ) and an employer, a pilot in command and a passenger should have every right to expect that the regulatory standard might preclude such problems being the acceptable level ?
In the UK (and some other jurisdictions) a CVD will not normally prevent the issue of a class 2 medical certificate with a daylight only restriction, however if further investigation of the deficiency confirms a sufficient lack of colour vision discrimination, then that will normally preclude the issue of an unrestricted class 1 certificate.
It might not seem so, but I do have every sympathy with an individual who finds themselves in this position. There are opportunities to re-test using other testing methods, and these other methods obviously may overturn the previous restriction. However there are reasons why the standards are in place. Clearly there are also reasons why different countries apply variations to those standards to suit their own situations.
I am not in any way responsible for those standards, although I understand why they exist. I also understand the reason why a CVD pilot should not present themselves in the flightdeck of a commercial airliner in many circumstances. I understand why this standard will disappoint those it affects. I understand that there are different levels of standard in the USA and maybe some other countries. I understand why there may be such differences.