Note: See comments for more "official" comment from Virgin on this.
A friend just got a virgin fibre in - only IPv4!
Asked about IPv6 and said "we don't support IPv6"
So explained IPv4 has run out, and they say "we have enough"
So how exactly does my friend connect to the rest of the world and IPv6 hosts?
Apparently the answer is they "do not guarantee anything beyond their own network" so the fact the rest of the world might have some IPv6 is not relevant.
Sounds to me like not actually any Internet connection then!