That’s why the pronunciation of “an history” is such a contentious issue in British political linguistics to this day. Crucially, as has been observed correctly

That’s why the pronunciation of “an history” is such a contentious issue in British political linguistics to this day. Crucially, as has been observed correctly, the rule is that one should use the appropriate indefinite article. That in turn depends on whether one pronounces, as pirates, or has a silent ‘h’, revealing one’s origins even once the guise of Received Pronunciation had been defensively adopted.