"Up to middle of last year there was a sim in HKG" True! And it was run by a reputable company, which means it is possible to tell who was using it at any given time. How many *legitimate* pilot proficiency checks can be accomplished in one two hour block of time? Would you be suspicious if five or more pilots claimed to have a p/c during the same small block of time? Would it set off alarm bells if some pilots claimed to have a p/c in HKG on a day when a different operator (one with whom they have no connection) was using the sim? The NCAA doesn't concern themselves with details like this......as long as all the paperwork has plenty of official-looking stamps on it!!