Thanks for rightly presuming that I might chip my 2 cents in Chris, imbéciles précipitent, or fools rush in if you prefer.
I think that the problem stems from the fact that the vast majority of English people are familiar with the word fiance as in the person to whom one is engaged.
Where it possibly falls down is that they’re unaware of the subtle difference between fiancé (masculine), and fiancée, (feminine), perhaps it would be better if in U.K. we all stuck with fiance, no accents, one size fits all.