Personally, I hate the Roberta Flack version . . It has none of the sexuality of the original, for starters . .MacColl was none too keen on it either, except he commented that every time he heard it he just thought of the royalties continuing to help him with his more worthwhile activities . . .
Also, I'm with the "unaccompanied" opinion here; a dollup of instrumental syrup does the song no favours at all . .
G.