David
Obtaining a FAA ATPL under more relaxed colour vision rules would enable you to fly in UK airspace, land at Heathrow (the busiest airport in the UK).
Only one snag it has to be in one of those special US aircraft, and what is so special? The wee N number of the side, yes you've got it, as long as the aircraft is registered in the US.
That is why the present situation is so wrong and discriminatory.
What gives the UK CAA and the JAA the right to impose tougher restrictions than in other parts of the world, their charge is surely to enforce the Air Navigation Order which calls for "colour perception sufficient for the safe performance of airman duties"
Is a US airman any different to a UK one??
Food for thought.