The effect of Windows 10 on the networks varied, hence why the four BQM I posted were not identical. Of course it may be that there was an additive issue, i.e. not just one thing affecting their network but lots of others.
As things stand now with the handful of Vispa BQM have running everyone say a 30 minute window of packet loss around 6:30am GMT and variable latency between 30 ms and 140ms plus looks common during the evening, plus some packet loss.
Cause unknown, but an ISP will know where traffic is going from and to, even if it cannot tell exactly what it is, e.g. is this youtube streams, or Akamai cached content or torrent traffic or BBC iPlayer etc