By Bethany Dowell Often when I hear that there is going to be a celebrity rendition of my favourite reality TV show, my heart sinks. However, when I found out that The Traitors UK  was expanding to the celebrity domain, I couldn’t help but feel giddy inside. Despite only two episodes being aired so far, it’s already clear that The Traitors: Celebrity UK might just be the rare spin-off that works.     Before any reality TV show airs, casting is the most significant talking poi