Need support for the Broadband Forum TR-187 dual-stack on IPv6. Needed by MOST UK ISPs

Running firmware 4.3.5-3 updated today 2/May/2018 but still no connection with ZEN ISP.

Zen say this is a known issue for both ZEN and a number of other UK ISPs.  IPv6 roll-out is gathering speed, you need ISP compatibility. I understand most UK ISPs are members of the broadband forum and support only TR-187 dual-stack operation.  Surely you can make this an option.