How do I setup two indivudal networks using a BT Smart Hub 2?
There isnt a dual band option on here.
You can't. That is a limitation of the Smart Hub 2.
There is a workaround but it will cost you in the region of £30 so maybe not worth it.
Simply disable 2.4GHz on the hub Wi-Fi and connect something like the BT Homehotspot 600 to the hub to provide a 2.4Ghz carrier with it's own SSID
Or be sensible and get a suitable third party router.