Discussion Groups / British English / September 2009

I am somewhat confused about the proper British pronunciation of words
like "ordinarily", "temporarily", and "momentarily".
As I understand it, in British pronunciation the adjectives
"ordinary", "temporary", and "momentary" all have a silent "a",

As per phonetics theory, I've been told one should use the indefinite
article "a" before words beginning with a consonant and "an" before
words beginning with a vowel or a diphthong. And the sound "y" ( or /
j /   in phonetic script) as in "eulogy", "university", "European"