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"I need to know whether the expression is still widely used in the UK and the US."
This is all very well as long as you do not turn down somebody offhand just because (s)he is a non-native.
A non-native's opinion you deem as doubtable, questionable, without a second thought; on the other hand, when a native comes with their unquestionable authority, you take what they say as gospel truth.
I do not agree with you in this respect.
Re: rejecting an invitation 
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