If the trainer industry was a country, it would be the world's 17th largest polluter - yet major manufacturers all make claims of sustainability. Darcy Thomas travels to the Maldives to assess the ecological impact of the industry, putting the big brands' green credentials to the test.

An investigation into concerns that senior Metropolitan Police officers were linked to organised crime and that murders were going unsolved because of corruption, in a bid to address claims that the Met is institutionally corrupt.