Forgot to add something to this..
Whilst I was picking the car up yesterday, the lady behind the service desk was chatting to me about Alfa 'Campaign' recalls and how the one I had done seems to cure most Selespeed faults (she seemed pretty clued up on the Selespeed actually!). She then went on to say that Alfa were probably going to be knocking a lot of the older Campaignes of the list soon and that one was a likely candidate to be one of them to go.
She said this would mean that, at the very most, dealers will probably be able to ofer some kind of 'deal' with owners who need the update but they will not be offered it completely free of charge as they do now !!!
I dont know how much truth is in this but if anyone with a 156 Selespeed in the uk thinks theres hasn't had the 407 update I would get it booked in NOW!