Feb 2nd 2014
This site is now IPv6 enabled, it turns out that my co-lo provider already offers IPv6 addresses. So all I had to do was enable the ipv6 kernel module on the RPi, fiddle some iptables rules and the Apache config so it listened on the IPv6 address. Then head over to my DNS provider and drop the appropriate AAAA records onto my zone.
If you are running a dual stack from where you are browsing you may already already be using it but to force the issue try visiting ipv6.digimatic.co.uk