Hugh Fearnley-Whittingstall tells the story of how hundreds of thousands of people from all over the world came together and forced the politicians in Brussels to radically reform fishing policies. Three years ago, Hugh launched the Fish Fight campaign to highlight the problems facing our global fishing industry. Now Hugh goes back to the North Sea to find out how a more sustainable future for fish and for fishermen might work. Hugh is also back on the case of politicians, supermarkets and big businesses to make sure they keep their promises. One of the biggest fishing companies in the world and the Thai Government have announced they are taking steps to improve the sustainability of the prawns they sell to British supermarkets. Hugh wants to make sure they are continuing to address his concerns and that their actions are more than achieving just good PR. And a fresh investigation into tinned tuna reveals that some supermarkets, which made bold promises about their products in previous episodes of Fish Fight, appear to be introducing tuna back on the shelves that has been caught using unsustainable methods.