The indefinite article of English is either <a> or <an> depending on whether the following word starts with a consonant or a vowel sound - so far so regular. But what do we make of book titles such as these?
How do you pronounce the phrase "an historical" or "an historic"? Should it be /ən ɪstɒrɪk(əl)/ or /ə hɪstɒrɪk(əl)/? Could one also say /ən hɪstɒrɪk(əl)/?
Well, Alex Rotatori has spotted an interesting spoken example of the latter version (though the indefinite article is used here in its strongform /æn/); it's taken from Theresa May's speech in the House of Commons announcing the delivery of the Brexit letter to His Excellency Mr Donald Tusk, president of the EU.
Is it something which occurs occasionally, even regularly, is it idiosyncratic or just a slip of the tongue/brain?