Just as an update to this, Openreach worked on the cab today (quick turn around). Now my phone line is normal, i've resync'ed and I've got these stats:
Current Rate 77237 kbps 11993 kbps
Maximum Rate 97659 kbps 20132 kbps
Signal-to-Noise Ratio 6.3 dB 6.8 dB
Incredible change up in the downstream, that's given me about 30Mb more speed as I was syncing at around 42Mbps before. I'm not sure if it was just the 'E' side which was fixed or if he found other issues...but that's an incredible change up really.
Any reason why the upstream is at is though? I'd have thought I'd get closer to the 20 for that, given that I'm almost maximum on my downstream.