I've found these forums to be a wealth of information on this topic. My Fiesta Titanium (58 plate) came with the USB/Bluetooth module from the factory.
The module fitted in the car was 8M5T-19C112-AK - one of the older Nokia ones. This didn't support bluetooth streaming which is something I wanted. I ran the USB update, aware that I needed an "AM" onwards module to get the streaming working correctly through the menu. I could get it working using the VC though - External Device > Bluetooth > Play command. Obviously nothing displayed, and I couldn't use the steering controls but it played.
I took it to a Ford dealer to ask for any display/radio updates to be done on IDS. They charged me £40 and told me that the audio was already up to date. Presumably they just meant the USB update which I had already done.
So I went to buy a Novero AU7T-19C112-AT (FINIS:1754709) the newest module with the older proprietary connector. Now after installing it and again upgrading the software, I still do not have the Bluetooth Audio option in the Aux menu. Is there a display update that is holding me back? ETIS already shows I have iPod/USB/VC. Did the dealer just fob me off? They didn't seem to understand what I was talking about.