EPIRB,
I think you'll find it very different if they are US Nationals who have been using their US ATP to operate in the US. The 'block', if you like, is on Aussies going over and getting an "easy" ATP, then trying to convert.
Of course, if you want to try the UK CAA/JAR road, take your chequebook with you; just ask Reddo!!
G'day
