Gemma Arrowsmith (‘Agatha’) writes at length about the work that went into making this CBBC series.
There’s a great deal of editorial policy that you don’t even consider as a viewer. If the contestants are eating leeches, you must make it clear that it’s really just licorice dipped in treacle and no-one at home should try eating leeches. It’s called “copyable behaviour”. We usually covered the rather dry disclaimer with a gag, something along the lines of “you should only take leeches if you are accompanied by a dead tour guide.” That type of thing.
