[AusNOG] "Sky completes roll out of IPv6 becoming the first major UK Internet provider to future-proof its service for customers"

[Mark Smith]

https://corporate.sky.com/media-centre/news-page/2016/sky-completes-roll-out-of-ipv6-becoming-the-first-major-uk-internet-provider-to-future-proof-its-service-for-customers

"Sky today announces that over 90% of its broadband customers are now
IPv6 enabled"

and going by this article, that is 5.34 million subscribers IPv6 enabled.

http://www.ispreview.co.uk/index.php/2016/04/uk-isp-sky-broadband-grows-6-million-subscribers.html