IPv6 at home from BT
It works - 10/10 on test-ipv6.com; can't really say fairer than that. I did however enjoy the comedy reverse DNS:
$ curl http://files.dnorth.net/ipquick.php (05/04 19:19) 2a00:23c4:e81:3100:fdbc:e60a:226e:9903 broadband.bt.com
Oddly enough, broadband.bt.com doesn't resolve forwards to every IPv6 address on their network, so why bother claiming the reverse?