I’m pleased to be able to advise that this site should now be accessible over IPv6.
NearlyFreeSpeech.net have begun offering experimental support, and it appears to be working. This site’s address (not that this should make any difference) is
2607:ff18:80:0:0:0:0:4f, but if your network is configured to prefer IPv6 you should be served over v6 automatically. If your ISP has already rolled out IPv6, then please inform me of any issues—otherwise, access should continue as normal, and should be seamless when your ISP switches to IPv6. (My ISP, O2/BE Internet, have just completed the network upgrade that will allow them to deploy IPv6, hopefully in the near future.)