Fi Glover, Martha Lane Fox and Henrietta Moore from the Institute for Global Prosperity at University College London are building an imagined utopia made up of the best solutions to the world’s problems. They look at a sustainable fishing scheme in British Columbia in Canada called catch share, a quota system based on dedicating a secure share of fish to individual fishermen, co-operatives or fishing communities.

It means fishermen have the ability to catch a certain amount of fish each year and are responsible for not exceeding that amount, promoting stewardship of the seas.

Just outside Vancouver, local reporter Madeline Taylor goes to meet the fishermen who spearheaded the scheme at the British Columbia groundfish fishery, which has evolved over the last 40 years from an open access, high discard fishery to a full retention, fully monitored fishery that accounts for all catch whether retained or released.

Could it work elsewhere? With the help of Erin Priddle from the Environmental Defense Fund, the team discuss the achievements and shortcomings of this model for sustainable commercial fishing and whether it should be adopted as a policy for an imagined perfect country.