Congratulations Miles ! That makes at least 5 of us who succeeded in adding a Superdrive or Blu-ray to a Mac Mini 2011-2012. It is interesting that you used the same Mac Mini 2011 that I did, but that you also had to remove the #4 connector pin from the ODD SATA flat cable to make it work with your UJ-267 Blu-Ray writer. Up to now, I thought this problem related only to the Mac Mini 2012, since I did not encountered it with my own AD-5960S Superdrive. I have since added a comment to my original tutorial on www.123Macmini.com.
Actually, it is quite possible, with some tweaking, in 3-4 hours; see this post on www.123macmini.com. We now only have to hope that enough people will get interested so that iFixit will provide an all inclusive kit to do that in less than 60 mn :-)