UK distribution is by Gonzo itself (listed on the back as released by GDH KK). GDH is the holding company of Gonzo for those who do not know. This is the first time I have seen them distribute/release a title themselves outside of Japan with the only anime they directly released there that I have seen was Speed Grapher.
The DVD itself has some interesting trailers on it, including Gankutsuou (Count of Monte Cristo), Witchblade, Burst Angel, Samurai 7 and Gantz. Out of those, of course, Gankutsuou and Witchblade have yet to surface in the UK.
It seems a little odd that they would decide to handle distribution of the DVD themselves and makes me wonder what that might mean for the future.