There's 101 reasons that could make your speed tests jump up.
DLM changes, vectoring on the cabinet, crosstalker being on holiday or ceasing their line.
We really need to see xDSL statistics from the modem.
There's nothing Talktalk could do to incase speeds like that even if they wanted to. They have no control of the DSLAM or DLM, and they do nothing that could have limited the speeds in any way.
Edited by j0hn83 (Thu 21-Jun-18 17:06:21)