There are quite some dialects that use vowel-beginning diphthongs like [ɪu] for what is /juː/ in the Received Pronunciation and General American dialects.
Do speakers of these dialects (tend to/want to) use an, not a, before words beginning with this diphthong, e.g., do they say:
Do they use an nearly all the time, sometimes, or about never? If they do use a, is there an explanation? Is there a pattern of distribution of the two forms of the singular indefinite article?