Thousands of people march through central London demanding action on cleaning up Britain's rivers and seas, with stricter enforcement of companies who break pollution rules. "Unfortunately, 85 percent of our rivers are failing to meet the standard of good ecological status, which was defined when we were part of the European Union," says Mark Lloyd chief executive of the Rivers Trust. "We really need to up our game and take concerted action and have a really clear plan for how we can get them back to good health." IMAGES AND SOUNDBITES