honestly i think the most common practice is to simply copy the countries from the imdb you have something like harry potter which is produced by warner bros but is listed as a uk us film dr zhivago is also an mgm production but was listed solely as a uk film although i removed that yesterday since there is no agreement among the sources on what nationality that film is i think generally it's probably not wise to follow precedents on other articles in which case we would still ironically end up with a uk us listing by just copying the imdb countries because they all have different standards of editing i much prefer the alternative solution put forward in saying what is american about it and what is british it feels much more encyclopedic to me