I have had superpowered fibre for about a month and have only got 37Mbps. I originally had about 33Mbps when on Medium fibre. I have tried different times of the day and night and also connected to the router using a cable. I have restarted the fibre modem and the router. Nothing has made a difference. I have also tried this with just the one device on the network. It certainly isn't worth the extra.
I am also having trouble when using my mobile on wi-fi and trying to use my three InTouch app to talk, I have no problem with the message side of the app. It is also the same when using wifi calling on other apps. I am wondering if the two issues are related.
Gav