Facts are facts. Roy Johnson had not updated the site in a year, and had not updated the website's contact details with Nominet. Even if he came back tomorrow, his claim to the site is pretty much finished. We can only assume he has gone to ground because of personal circumstances which were too sudden for him to pass on the website to another party, or he simply can't be bothered.
In the light of such circumstances, Nominet made the right decision.