In the previous 3 parts of "Our Narrowboat Experience", Tony and Christine shared the story of how they found and purchased a wonderful canal boat called Tickety-Boo. In the last (part 3) episode, they gave their reasoning for coming to the decision to sell her, but they held one BIG reason back for this final (part 4) episode of "Our Narrowboat Experience".
In this episode they tell their true English Canal Nightmare story. This awful experience tipped the balance and made them decide to sell Tickety-Boo; but after they made that decision the experience turned ugly, ending in a bitterly fought lawsuit.