Well the big day arrived after a 2 week wait. Initially I connected at 4862kbps which was at the lower end of the predictions.
However the Downside was that the stats on the line changed.
Downstream Line attenuation went up from 52db to 55db.
Downstream Noise Margin dropped from 23db to 6db then throughout the day it dropped to 0db and beyond.
I am using the Netgear DG834v3 router which seems to report a vvLarge Noise margin in these circumstances
Result that I experienced dropouts, throughout the day.
So I am back where I was with an unstable line connection. Having spent many reports with BT(OR) openreach and BTw on line faults and with Netgear on revised Firmware full and Beta versions.
A report to Netgear yesterday has resulted in a new full Firmware Version V4.01.18 (hot off the press its not shown on support pages).
This appears to be more stable (at the moment) but I suspect it has resulted from Vista testing rather than addressing some fundamental problems with the UK version of this Router.