I do wish people would stop using American terms - the Prime Minister's wife is not the "First Lady" - she has no official title but ... #259
From Webster:
First Lady
noun
the wife or female partner of the chief executive of a country or jurisdiction
Definition of FIRST LADY
the wife or female partner of the chief executive of a country or jurisdiction; also : someone who is not the wife or female partner of a chief executive but who fulfills the public duties of a First Lady; the leading woman of an art or profession… See the full definition
Sir Winston Churchill said:
Perhaps he should have included Canada ?"The U.S. & the U.K. are separated by a common language." WC