Right... in spite of the test showing very few errors it seems that BT still have the line down as erroring a fair bit and the quality is set to amber. This means unfortunately that if we do remove the banding it won't uplift very far and there's also around 50% chance that the banding will be applied again straight away. I suspect that was a problem with the test as further diagnostics are showing errors every 400 seconds or so - this needs to be around the 1000 second mark in order to remove banding.
The agent is suggesting applying interleaving as this will reduce the errors greatly and the ping disruption is much less on 21CN than it is on 20CN.
With regard to the new router, it may have lowered the upload speed slightly but it's dropped the errors from 1 every 29 seconds to 1 every 400 and is also the reason the connection has stabilised, so it's not all bad.
