[RaRic]

"An historic event" is wrong:

An is the form of the indefinite article that is used before a spoken vowel sound: it doesn’t matter how the written word in question is actually spelled. So, we say ‘an honour’, ‘an hour’, or ‘an heir’, for example, because the initial letter ‘h’ in all three words is not actually pronounced. By contrast we say ‘a hair’ or ‘a horse’ because, in these cases, the ‘h’ is pronounced.(http://www.oxforddictionaries.com/page/aoranhistoric/a-histo...)

[frobozz]

There's nothing wrong with "An historic event".

I'm from London.

(However, it does irritate me no end to hear RP speakers say "An historic", pronouncing the "h")

[stretchwithme]

yeah, I hear people pronounce the "h" and use "an" but not do it consistently. Didn't realize its silent in England.