I am thinking of getting a 5GHz dual band router as there is a lot of interference in my area (inssider gives my Homehub2 a link score of 50 on a good day!)
Am I able to connect the 5GHz router to the homehub via ethernet as a "secondary" router as we need the homehub2 for BTVision?
You could use another dual band router as a wireless access point only, or you could buy a dual band wireless access point.
Either of those would plug into a spare Ethernet port on the home hub 2.
Bear in mind that the range at 5GHz is quite short, and you may be better using either a direct Ethernet cable, or powerline adapters, if your connected devices have Ethernet ports.
my router is plugged in downstairs for the BT Vison and my other devices are upstairs (about 15 meters minimum) so ethernet is out the question. 😃
Would range extenders improve speeds?
How do powerline adapters work?
Range extenders will not help if there is interference, they will only make thing worse.
Powerline adapters see
BT also have some options
The broadband extenders also use the mains wiring, but use a different standard than powerline adapters.