I'll leave it to the guys to explain more on their own blog on the Moore Group website but in the meantime you can read a little more here, have a look at some more of the photos from the brew day on their photostream and you can download the nineteenth century article that inspired the experiment. You can also listen to Billy talking about the ale on Newstalk's Moncrieff show. Just click on the popout player, go to archive and the Moncrieff show for September 23rd. Billy is on the second part, about fifty minutes in.
Unfortunately I can't make it to the tasting party but I wish them luck and I've no doubt there'll be a few nursing Viking scale hangovers the next day.