I am with Fusion Fibre using the City Fibre network. My connection is a symmetrical 900Mb.
Over the last 18 months I haven't managed a down speed of 900Mb any time of day, although upstream is always over 900Mb. Should I not get the advertised speed occasionally? I test speed using the Ookla desktop app on an Ethernet connection.
Furthermore, given that I have a full fibre connection and City Fibre allegedly have a future-proof network, I am getting a pretty spiky profile on TTB. Even though my BB use is high, surely things should look smoother than this with so much packet loss.