I forgot to look at the steering wheel properley. When I saw the keys in the dealers hand there were 2 keys in the bunch.
Actually the Zetec (and all lower ones) comes with TWO keys - it's just that one of them doesn't have any remote/electronic features, it's just an old-fashioned key. It doesn't look much different from the other one, however. If the keys were Zetec ones, they would be noticeably large, and whilst a Titanium's would look similar *if unfolded*, but they do fold whereas the Zetec's don't. The folding ones have a prominent silver button near one of the lower corners of the fob, I think (for pinging them open).
(edit: looking at a pic of the Titanium key on the thread about the little model of a Fiesta, their fob is bigger than the Zetec's, with white icons for the functions, but with a smaller-looking key shaft than the Zetec's.)