Deathstar to give you an idea what supports ipv6, nearly all of EE 's traffic is ipv6, and the majority of sky's traffic as of 2 years ago was ipv6 never mind now.
Mainstream services such as facebook, netflix and youtube have utilised ipv6 for years now. They dont require ipv6 but will utilise it if its on your connection.
The backward way of thinking is that one shouldnt bother with ipv6 until services they use require it.
BT and sky, 2 of the biggest UK isp's have rolled out ipv6 to millions of customers, so one could say it is now commonplace in the UK.