I've just found out that the checks on the FTTC checker site I used says I have an uplift of 4.5. I currently get around 6.5 mbps on ADSL so that doesn't sound like much of jump to me so perhaps there is not much to get too excited about other than the possible upload speed increase. I work from home so that would be a good benefit. I had thought the speed increase may have been proportional.
You say you thought "the speed increase may have been proportional" but proportional to what? The uplift estimate means they think you might get in the vicinity of (4.5 x 6.5 =) 29 Mbps down.
As I understand it the major factors that determine your uplift are the copper from the cabinet to your home (VDSL beats ADSL more the shorter the cable, it's not just linearly faster because of the way different signal frequencies behave) and the copper from that cabinet to the exchange (which obviously the fibre is removing from the equation, so the longer that was, the bigger the advantage from side-stepping it).
I agree though that going from 6Mbps download to 30Mbps, or 40Mbps (or even 80 or 110) isn't necessarily that big a deal and that for those who use it the improved upload can be a more dramatic difference.