Re: Ordinarily, temporarily, momentarily

I think the concept of 'proper British pronunciation' died a long
time ago, and it seems that nowadays anything goes.
That said, your three examples are not exactly parallel. I pronounce
the first adjective with three syllables, the second with four and
the third with something in between depending on the context; the
word doesn't sound the same in "a momentary lapse" and "the lapse
was momentary." The accent is on the first syllable in every case.
So I can't agree with your understanding. On the other hand, I
pronounce all the adverbs with stress on the 'a'. I find it very
uncomfortable trying to say 'temporarily' without pronouncing the
'a'.

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",
whereas Americans not only pronounce the "a", but have a secondary
stress on that letter.

But what happens when you turn the adjectives into adverbs? According
to my dictionary, the proper British pronunciation is still to have a
silent "a" in "ordinarily", "temporarily", and "momentarily" and
pronounce them all with the stress on the first syllable. However, my
feeling is that many British speakers use the American pronunciation
and stress the "a" in these words.

What is common and what is considered correct British?

--
Claus