It seems that the Next Top Model series is a global franchise where they repeat the same stunts in many different countries on their versions of the shows....and the UK is a little slow to do this stunt, cos Heidi Klum already did the exact same thing on Germany's Next Top Model back in in 2008 ... see here
http://www.thewambank.com/videos.php?id=8168&list=0 They did the same thing with the wetlook fashion water tank stunt too...i.e. it was first done on the original American version of the show, and then repeated later on the Greek, Russian, British and German versions of the show.
Anyway...the chocolate stunt was done very nicely on the German version 2 years ago, so I would imagine that the UK version should be worth watching too.
MK