I somehow get the impression that you don't believe me?
I also have a Check Point UTM-1 EDGE X ADSL Router which I have as a spare in case of Router failure (it doesn't have Wireless capabilities for guests outside of my SBS LAN so I had a re-jiggle and put the D-Link Router in it's place) which I used before the D-Link device and that reported very similar stats.
On another note I actually did a visual this weekend too.
Although we are Rural I drove the road back to the FTTC (cab) from my house (it is a direct road). I found 4 DP's on route and each one served circa 3 to 4 properties max. All of the DP's were served by a cable coming up from the ground and were not linked via an overhead cable in any way, this was very obvious. This leads me to believe that possibly the cable from the box to the premises is actually coming along the GPO cable tunnel, could this explain why I have a pretty clean line? I also clocked the distance and it is as the original BT Engineer advised - 1.6 miles exactly to the FTTC (cab) from the premises.
I still have this out with BT and they are dues to get back to me today, although they promised they would get back to me last Tuesday and didn't so I will wait ond see!