Excellent! thanks Maggy, I dont feel as guilty now for pestering Seph with questions every few days for over a month. First over on VM forum then I stalked him over here, poor bloke
Just an update, after my last post I had another couple of T4's and they could see noise on the line again. Ive been told that the lines now been recommissioned from the cab back up to headend and that the noise is now no more

Not lost connection for 12days now so things are definitely looking rosy.
Still got the codewords climbing but I may not need to worry about those, just need to use another laptop to check my speeds to double check they arent affected. Looks like they have gotten to the bottom of it now