Activist Kate Wilson took on the Metropolitan Police for breaching her human rights – and won. Wilson had a one-year romance with a man named Mark Stone in 2003, but years later discovered he was a married police officer, and part of a unit that infiltrated environmental groups, forming sexual relationships and spying without warrant on hundreds of innocent civilians. Hear Wilson talk to writer Oliver Bullough about how it took her nearly 20 years to uncover the eerie truth about Britain’s secret political police, and why her story and fight matter.