So tonight I have installed the new SR102 Sky sent me. Only my laptop connected via ethernet and this is what I got:
http://www.thinkbroadband.com/speedtest/results.html...
One device connected, wifi switched off with the modem syncing at:
Modem Status Connected
Traffic Type:PTM
Line Rate - Upstream (Kbps):20000
Line Rate - Downstream (Kbps):67851
Line Attenuation 14.6 dB 0.0 dB
Noise Margin 6.4 dB 9.9 dB
So I am completely lost as I don't see what else this can be besides congestion.
plusnet Unlimited Fibre (FTTC) > Sky Fibre Pro Unlimited. 15ms Ping, Sync ~ 68.93/18.83Mbps