Comments found online regarding Vueling :-
" It's not confirmed but, there is a lot going on behind the scenes at IAG regarding Manchester. I'm genuinely not allowed to say any more, but, there are exciting times ahead."
"Vueling is instead of BA per se. IAG are using vueling as the low cost answer to operations. The amount of work IAG are putting into MAN is staggering behind the scenes."
All very interesting...