If the recent BBC adaption of Jamaica Inn deserved any prizes for lack of intelligibility, then surely The Next Step must surely also be up for an award.
The Next Step is a fictional drama made in the style of a documentary. The series comes from Canada and follows a group of teens who supposedly attend a dance studio called The Next Step. The diction is often unclear, with many actors hurriedly mumbling their lines. It was first broadcast in Britain on 7 April 2014, and the first 5 episodes were shown on successive weekdays.
Despite having been given a great deal of publicity on the CBBC channel, including three of the actors being invited on more than one occasion to the presentation studio as well as to Blue Peter on 10th April, viewing figures were not good - being significantly below 200,000 all week (BARB w/e 13 April)