If you have a Broadband and TV contract you will have a Hub and either a Tivo or V6 TV box.
I take it that you are using Wi-Fi to connect your devices ?
The only accurate way to measure your speed is to use an ethernet connected device.
What is your connection like with a direct connection using a Cat 5E/6 cable between the Hub and a 1Gbs capable Pc/Mac/Chromebook and no other devices connected ?
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BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.