Twas just under 1.6Mb/s...
... for me here in ruralville, Co Durham, but it didn't stop the calls to sell Vision. I played along once, to see how far it would get. Eventually they sent a letter to say sorry but my line couldn't support the service because it wasn't stable enough. Then they rang up a few weeks later to try again.
I eventually got the engineers to come out and fiddle-dee-dee it up to 3Mb/s by asking what I needed to do to join FON (not that I ever have).
I then later found out our exchange had been upgraded to Infinity, but not through BT calling - I spotted a house for sale about 4 miles away but on the same exchange that had Infinity available. I now get around 60Mb/s down and 20Mb/s up top speed.
Still, it's not all rosy - they're just about to wipe the storage on the Vision+ box in some mega-update, so I'll have to go out and buy the Zohan and roughly a million Octonauts episodes...