Finals,
There are more than a few Yanks that are equally licensed in the UK as you....thus it is not beyond consideration that Bronx may hold the same licenses as you and thus despite being in New York may very well have past experience in the UK.
The fact you are an aircraft commander does not make you an expert on the law....but should provide you the professional expertise whereby you might locate valid sources to back up your statements.
Perhaps if you provided some of those references he you might prove your point to Bronx and he would cease asking those questions of you.