Thank you greatly for the feedback. As you say, there's a big difference between the two BQM graphs.
The whole 2.5 hour spike thing has been a bit annoying, and Billion don't seem bothered.
I think I'll have to be having a word with Amazon about returning the 8800NL!
Are you using the TP-Link on an ECI or Huawei cabinet?
Pipex > Zen > Be > iDNet > Freeola > Zen > BT Infinity 1