I appreciate the replies, I'm a bit disappointed but not upset. When I looked at the event logs it went down at; 03:25:17, 26 Aug.PPP: LCP down
And the rest followed after connecting up and interestingly found the initial noise margin on this line;
03:27:32, 26 Aug.DSL Link Up: Down Rate=69537kbps, Up Rate=20000kbps; SNR Margin Down=4.2dB, Up=8.4dB
The SNR Margin was 4.2dB but has stayed steady at 3.7-3.8
According to the BT IP profile/BRAS checker thing it's set at 67.31 downstream and 20 upstream. I'm probably looking into this too much and should go for a walk.
I'm going to make the most of it either way. Hopefully more lines are added to the ECI test.