Turns out they'd switch me back to gdmt so they've now changed it adsl2+ again but still basically the same stats apart from the downstream attenuation going back up to 42
Quick update after lots of testing and tweaking they have found that my broadband cable is touching my phone cable and should hopefully be fixed over the weekend!!
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Sky have raised a viper case, whatever that is lol, bt engineer just been to my house and can't find anything wrong, next step is possibly a broadband boost engineer so they can delve deeper!!