In this CHALLENGE SPECIAL from Fox International, Mark and Harry have to join forces to complete a Challenge that Mark had previously failed! 5 years ago he was tasked with catching from a River, a Canal and a Lake from 3 different countries which ended in a big fat fail! This time he has to catch 2 carp from each of those waterways and now Harry is on his side! Can the pair catch the carp required to pass or will it all end in tears?