I have read I can get it by upgrading to the very latest version of BT Home Hub (I am using 5). I ordered it yesterday. But my current Home Hub 5 is compatible, and I still don't have IPv6.
Re:IAB Statement on IPv6
by jburgess777 on Tuesday November 08, 2016 @07:39PM
(#12905248)
It looks like you would have got support on your existing device soon. A recent BT presentation says:
"[IPv6 support] Home Hubs 4 and 5 support from early 2017"
http://www.ipv6.org.uk/wp-content/uploads/2016/11/UKIPv6Coun...
BT have at least partially rolled out support, as I have a v6 allocation on a BT broadband service.