Jedward's Big Adventure
Initial for CBBC channel, 6 February 2012 to present
With one eye to their future career options, John and Edward Grimes try their hands at being a tour guide. They're given a professionally-guided tour around some of Britain's most interesting historic sites. Joined by celebrity guests, the duo lead a collection of tourists around the same place. Whichever twin imparted the least knowledge will suffer a forfeit.
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The brothers are, apparently, experts on the Tower of London, Blaenavon ironworks, the Jurassic Coast, Edinburgh, and Vindolanda. That's "expert" in the sense of "they guided tourists around these places".