Does anyone have a clue how to make this work? It's invaluable to me and I can't change the DNS settings on the BT Infinity hub?
You will not be able to change DNS settings on the BT Home Hub 3. Unfortunetly. The HH3 is locked down to BT, so I am guessing that only BT services can be used on the hub. If you can/could you could manually set the DNS address on each device that connects, or you could buy a third party router such as a Netgear or D-Link, they will allow you to change the DNS settings.
I am not sure if the Home Hub 4 includes this. I don't have a HH4 with me but a user called jonew has a homehub 4. Ask him about it, but I doubt you will be able to change DNS settings on that as well, the BT Buissness hubs do allow you to change DNS settings but your going to have to buy it.
You can't change the DNS settings on the HH3 but you could change it on your PC settings, which then overide any router DNS settings.
But I think the OP was talking about using a HH3 device, not an own router