This is a very fine performance and arrangement of a White Album out-take that Paul McCartney gifted to his scouse friend and fellow George Martin producee. McCartney's original demo. had traces of Jobim in it:
but Cilla's version rotates that influence 90º through Bacharach's appropriation of that tradition, surprising/climaxing with a trace of Bond/John Barry in the chorus. Marvellous stuff that anticipates some of where McCartney would go post-Beatles.
It would be interesting to know how much of Cilla's arrangement McCartney was responsible for. And if the answer to that question is 'a lot', whether he'd have thought of developing the song in that direction without Cilla's Bacharach-laden example in front of him? At any rate, here's a snippet of Paul and Cilla setting up to record the song: