You can check if your BT Homehub is configured for n capability in Settings, Advanced, Wireless Configuration. The choices are 802.11b/g/n (recommended, 802.11b/g or 802.11n.
And you can check the Wireless Adapter settings via Control Panel, Network and Internet, Network and Sharing Centre and clicking on the Wireless Connection. That should bring up your WiFi Status and show you both Signal Quality and Speed. Mine flickers between 117 and 144Mbps.