Could i just ask for a word like 'cosaint' do i sound the 'a' is it [cosa-int] with a slight touch of the a or is it just [cos-int] And what is the general rule of pronunciation when two vowels come together? I should really know this and i do for some words but for others not really :/
I think it's just [cos-int], because that other vowel is a filler to balance out the broad vowel at the start.
My general impression is that if you have "vowel - consonant - 2 vowels", of the two you pronounce the one that is the opposite (broad/slender) of the initial one on the left side of the consonant. I could be wrong, though...
It depends where you're from the pronunciation if different parts of the country is very different I am from the north of the country and would pronounce it cus anch
I'd agree with Tanager's "cos-int", as for other combinations, "ao" is generally pronounced like a broad a, though the initial letter would have a w sound afterwards, so "caol" (narrow) is pronounced "quail", and baol (danger) as "bwail".